Brm and brg1 targeting antibody-drug conjugates and methods of use thereof

Abstract

The present disclosure provides antibody drug conjugates and drug- linker compounds comprising one or more degrader compounds which comprise a SMARCA 2 or SMARCA4 binding moiety and an E3 ubiquitin ligase binding moiety that binds a Von Hippel-Lindau E3 Ubiquitin Ligase or a Cereblon E3 Ubiquitin Ligase, and methods of use thereof.

Description

BRM AND BRG1 TARGETING ANTIBODY-DRUG CONJUGATES AND METHODS OF USE THEREOFCROSS-REFERENCE(S) TO RELATED APPLICATION(S)

[0001] This application claims priority to U.S. Provisional Patent Application Nos. 63 / 560,527, filed March 1, 2024, 63 / 687,997, filed August 28, 2024, 63 / 710,947, filed October 23, 2024, and 63 / 743,815, filed January 10, 2025, each of which is incorporated herein by reference in their entirety.BACKGROUND OF THE INVENTION

[0002] The human S Witch / Sucrose Non-Fermentable (SWI / SNF) complexes are ATP- dependent chromatin remodelers. These large complexes play important roles in essential cellular processes, such as transcription, DNA repair and replication by regulating DNA accessibility.

[0003] Mutations in the genes encoding up to 20 canonical SWI / SNF subunits are observed in nearly 20% of all human cancers with the highest frequency of mutations observed in rhabdoid tumors, female cancers (including ovarian, uterine, cervical and endometrial), lung adenocarcinoma, gastric adenocarcinoma, melanoma, esophageal, and renal clear cell carcinoma.

[0004] SMARCA2 (BRM) and SMARCA4 (BRG1) are the subunits containing catalytic ATPase domains, and they are essential for the function of SWI / SNF in perturbation of histone-DNA contacts, thereby providing access points to transcription factors and cognate DNA elements that facilitate gene activation and repression.

[0005] SMARCA2 and SMARCA4 share a high degree of homology (up to 75%).SMARCA4 is frequently mutated in primary tumors (i.e., deleted or inactivated), particularly in lung cancer (12%), melanoma, liver cancer and pancreatic cancer. SMARCA2 is one of the top essential genes in SMARCA4-mutant (deleted) cancer cell lines. This is because SMARCA4 deleted cancer cells exclusively rely on SMARCA2 ATPase activity for their chromatin remodeling activity for cellular functions such as cell proliferation, survival and growth. Thus, targeting SMARCA2 may be a promising therapeutic approach in SMARCA4- deficient cancers (genetic synthetic lethality).

[0006] Previous studies have demonstrated the strong synthetic lethality using gene expression manipulation such as RNAi; downregulating SMARCA2 gene expression in SMARCA4 mutated cancer cells results in suppression of cancer cell proliferation. However,SMARCA2 / 4 bromodomain inhibitors (e.g. PFI-3) exhibit none to minor effects on cell proliferation inhibition [Vangamudi et al. Cancer Res 2015], This phenotypic discrepancy between gene expression downregulation and a small molecule-based approach led us to investigating protein degradation bispecific molecules in SMARCA4 deficient cancers.

[0007] SMARCA2 is also reported to play roles in multiple myeloma expressing t(4; 14) chromosomal translocation [Chooi et al. Cancer Res abstract 2018], SMARCA2 interacts with NSD2 and regulates gene expression such as PRL3 and CCND1. SMARCA2 gene expression downregulation with shRNA reduces cell cycle S phase and suppresses cell proliferation of t(4; 14) MM cells.

[0008] Therapeutic compounds that inhibit or degrade SMARCA2 and / or SMARCA4 have been reported. However, in some instances unwanted toxicities can occur. There remains a need for compounds that inhibit or degrade SMARCA2 and / or SMARCA4 with more specific targeting that reduces these effects. Antibody-drug conjugates described herein comprising an antibody that targets specific antigens and comprising a compound that leads to the degradation of SMARCA2 and / or SMARCA4 address this unmet need.BRIEF SUMMARY OF THE INVENTION

[0009] The present disclosure provides Antibody Drug Conjugate compounds, compositions thereof, methods of using said compounds and compositions thereof for the treatment of cancer, and Degrader-Linker compounds.

[0010] In one aspect, provided is an Antibody Drug Conjugate compound, or a pharmaceutically acceptable salt thereof, having the structure of:wherein,Ab is an antibody or an antigen-binding fragment thereof; L is a linker;D is a degrader compound of Formula (I):wherein,PTM is a moiety of Formula IA:wherein,R1is a covalent bond, or chemical moiety that links PTM and ULM;* is a point of attachment to ULM; n = 0-3; each W is independently optionally substituted -CH2-, -C(O)-, -S(O)-, or -S(O)2-, wherein when n = 2 or 3, only one W is -C(O)-, -S(O)-, or -S(O)2-, and the other W are -CH2- or substituted -CH2-;Rc1and Rd1are independently H, deuterium, Halo, C1-3alkyl, C1-3haloalkyl, or C1-4alkoxyl;Re3is hydrogen, -C(O)Rf, -CH2-O-P(O)(ORg)2, -CH2-O-P(O)(ORg)2, or -P(O)(ORg)2; wherein Rfand Rgare_independently H, C1-4alkyl, C1-4substituted alkyl, C3-8cyclcoalkyl, C3-8substituted cyclcoalkyl, C3-8heterocyclcoalkyl, or C3-8substituted heterocyclcoalkyl;Z and Y are each independently N; CRhwherein Rh= H, C1-3alkyl, or absent; or, if R1is attached to Z, then Z is C and Y is N or CRhwherein Rhis H or C1-3alkyl; or if R1is attached to Y, then Y is C and Z is N or CRhwherein Rhis H or C1-3alkyl;B is an optionally substituted 5-7 membered cycloalkyl ring, an optionally substituted 5-7 membered heteroaryl ring, or an optionally substituted 5-7 membered heterocyclic ring, wherein ring B is fused to ring G through Y and Z;ULM is a small molecule E3 Ubiquitin Ligase binding moiety that binds a Von Hippel-Lindau E3 Ubiquitin Ligase or a Cereblon E3 Ubiquitin Ligase; and subscript z is an integer ranging from 1 to 14.

[0011] In some aspects, provided is an Antibody Drug Conjugate compound, or a pharmaceutically acceptable salt thereof, of claim 1 having the structure of:wherein,Ab is an antibody or an antigen-binding fragment thereof; each D is independently a degrader compound of Formula (I):wherein,PTM is a moiety of Formula IA:wherein,R1is a covalent bond, or chemical moiety that links PTM and ULM;* is a point of attachment to ULM; n = 0-3; each W is independently optionally substituted -CH2-, -C(O)-, -S(O)-, or -S(O)2-, wherein when n = 2 or 3, only one W is -C(O)-, -S(O)-, or -S(O)2-, and the other W are -CH2- or substituted -CH2-;Rc1and Rd1are independently H, deuterium, Halo, C1-3alkyl, C1-3haloalkyl, or C1-4alkoxyl;Re3is hydrogen, -C(O)Rf, -CH2-O-P(O)(ORg)2, or -P(O)(ORg)2; wherein Rfand Rgare_independently H, C1-4alkyl, C1-4substituted alkyl, C3-8cyclcoalkyl, C3-8substituted cyclcoalkyl, C3-8heterocyclcoalkyl, or C3-8substituted heterocyclcoalkyl;Z and Y are each independently N; CRhwherein Rh= H, C1-3alkyl, or absent; or, if R1is attached to Z, then Z is C and Y is N or CRhwherein Rhis H or C1-3alkyl; or if R1is attached to Y, then Y is C and Z is N or CRhwherein Rhis H or C1-3alkyl;B is an optionally substituted 5-7 membered cycloalkyl ring, an optionally substituted 5-7 membered heteroaryl ring, or an optionally substituted 5-7 membered heterocyclic ring, wherein ring B is fused to ring Gthrough Y and Z;ULM is a small molecule E3 Ubiquitin Ligase binding moiety that binds a Von Hippel-Lindau E3 Ubiquitin Ligase or a Cereblon E3 Ubiquitin Ligase;L is a linker of Formula (III):wherein,M is selected from the group consisting of:whereinRb1and Rb2are each independently hydrogen or C1-C6alkyl, or Rb1and Rb2together with the carbon to which they are attached form a C4-C6cycloalkyl or a C4-C6heterocycloalkyl;Rb3and Rb4are each independently hydrogen or C1-C6alkyl, subscript si is 0 or 1, wherein the dashed line indicates the point of covalent attachment to the Ab and the wavy line indicates the point of covalent attachment to the remainder of the structure of L;U is absent or is -(CH2)b(Rv1)ss(C=O)u(NH)v- wherein subscript b is 0, 1, 2, 3, 4, or 5; subscript ss is 0 or 1; subscript u is 0 or 1; subscript v is 0 or 1;Rv1is -C3-C6cycloalkyl- or -C3-C6cycloalkyl-C(O)NHCH2-Rv2-, whereinRv2is C3-C6cycloalkyl, C3-C6heterocycle, or C3-C6heteroaryl; or-(CH2CH2O)wCH2CH2(NH)-, wherein subscript w is an integer ranging from1 to 16;X is absent or is-(CH2CH2O)wCH2CH2-(C=O)d- wherein subscript w is an integer ranging from 0 to 16 and subscript d is 0 or 1;-CH(Rx1)(CH2)nnC(O)-, wherein Rx1is hydrogen, -COOH, - C(O)NHCH3, or -(C(O)NHCH2)x(CH2OCH2)yRx2, wherein Rx2is - CH2NHC(O)CH3, - CH2NH2, or - CH2C(O)ORx2a, wherein Rx2ais hydrogen or C1-C6alkyl; subscript nn is an integer ranging from 1 to 6; subscript x and subscript y are each independently an integer ranging from 0 to 8;-C(O)-C(Rx3)(Rx4)-C(O)-, wherein Rx3and Rx4are independently hydrogen or C1-C6alkyl or Rx3and Rx4together with the carbon to which they are attached form a C3-C6cycloalkyl;-heterocycloalkyl-O(CH2)iC(O)-, wherein subscript i is an integer ranging from 0 to 6;-C(O)-C(Rx5)(Rx6)-OC(O)-, wherein Rx5is hydrogen or C1-C6alkyl and Rx6is hydrogen, C1-C6alkyl,wherein subscript f is an integer ranging from 0 to 4, and each Rx7is independently hydrogen, -COOH, -NH2, C1-C6alkyl, or an independently selected side chain of an amino acid; or-(CH2CH2O)yyCH2CH2NHC(O)CH2OCH2C(O) -, wherein subscript yy is an integer ranging from 0 to 16;YY is a branching unit selected from the group consisting of:wherein each qq is independently -N(Ry1)- or -O-, wherein Ry1is hydrogen or C1-C6alkyl; the wavy line indicates the point of attachment to X, when present, or U, when X is absent, or M, when X and U are absent; and each dashed line indicates the point of attachment to ZZ when ZZ is present, or to AA when ZZ is absent, or to J when AA and ZZ are absent, or to G when AA, ZZ, and J are absent; each ZZ is independently -(CH2CH2O)wCH2CH2C(O)-, wherein subscript w’ is an integer ranging from 0 to 16; each AA is independently absent or has the structure of:wherein subscript c is an integer ranging from 1 to 12; each Ra1is independently -COOH, -NH2, or an independently selected side chain of an amino acid; each J is independently absent, -(Rj3)N(C(Rj1)(Rj2))m1, or has the structure of.whereinRj3is hydrogen, C1-C6alkyl, or C3-C6cycloalkyl; each Rj1and Rj2is independently hydrogen, C1-C6alkyl, C3-C6cycloalkyl, - OH, or -NRj4Rj5, wherein Rj4and Rj5are each -OH or C1-C6alkyl; subscript ml is an integer ranging from 1 to 6; each Rjis independently halogen, C1-C6alkyl, or -C(O)NH(C1-C6alkyl); subscript k is an integer ranging from 0 to 4; each G is independently absent,and wherein the wavy line to M of Formula (III) indicates the point of covalent attachment to Ab and the wavy line to each G of Formula (III) indicates the point of covalent attachment to D, wherein subscript z is an integer ranging from 1 to 14.

[0012] In some aspects, provided is a pharmaceutical composition comprising an Antibody Drug Conjugate compound described herein and at least one pharmaceutically acceptable excipient.

[0013] In some aspects, provided is a method of treating cancer in a subject in need thereof comprising administering to the subject an effective amount of an Antibody Drug Conjugate compound described herein, or a pharmaceutically acceptable salt thereof, or a pharmaceutical composition described herein.

[0014] In some aspects, provided is a Degrader-Linker compound, or a pharmaceutically acceptable salt or solvate thereof, having the structure of:wherein,L’ is a linker precursor; andD is a degrader compound of Formula (I):wherein,PTM is a moiety of Formula IA:wherein,R1is a covalent bond, or chemical moiety that links PTM and ULM;* is a point of attachment to ULM; n = 0-3; each W is independently optionally substituted -CH2-, -C(O)-, -S(O)-, or -S(O)2-, wherein when n = 2 or 3, only one W is -C(O)-, -S(O)-, or -S(O)2-, and the other W are -CH2- or substituted -CH2-;Rc1and Rd1are independently H, deuterium, Halo, C1-3alkyl, C1-3haloalkyl, or C1-4alkoxyl;Re3is hydrogen, -C(O)Rf, -CH2-O-P(O)(ORg)2, or -P(O)(ORg)2; wherein Rfand Rgare_independently H, C1-4alkyl, C1-4substituted alkyl, C3-8cyclcoalkyl, C3-8substituted cyclcoalkyl, C3-8heterocyclcoalkyl, or C3-8substituted heterocyclcoalkyl;Z and Y are each independently N; CRhwherein Rh= H, C1-3alkyl, or absent; or, if R1is attached to Z, then Z is C and Y is N or CRhwherein Rhis H or C1-3alkyl; or if R1is attached to Y, then Y is C and Z is N or CRhwherein Rhis H or C1-3alkyl;B is an optionally substituted 5-7 membered cycloalkyl ring, an optionally substituted 5-7 membered heteroaryl ring, or an optionally substituted 5-7 membered heterocyclic ring, wherein ring B is fused to ring G through Y and Z; andULM is a small molecule E3 Ubiquitin Ligase binding moiety that binds a Von Hippel-Lindau E3 Ubiquitin Ligase or a Cereblon E3 Ubiquitin Ligase.

[0015] In some aspects, provided is a Degrader-Linker compound, or a pharmaceutically acceptable salt thereof, represented by the structure of:wherein,each D is independently a degrader compound of Formula (I):wherein, PTM is a moiety of Formula IA:wherein,R1is a covalent bond, or chemical moiety that links PTM and ULM;* is a point of attachment to ULM; n = 0-3; each W is independently optionally substituted -CH2-, -C(O)-, -S(O)-, or -S(O)2-, wherein when n = 2 or 3, only one W is -C(O)-, -S(O)-, or -S(O)2-, and the other W are -CH2- or substituted -CH2-;Rc1and Rd1are independently H, deuterium, Halo, C1-3alkyl, C1-3haloalkyl, or C1-4alkoxyl;Re3is hydrogen, -C(O)Rf, -CH2-O-P(O)(ORg)2, or -P(O)(ORg)2; wherein Rfand Rgare_independently H, C1-4alkyl, C1-4substituted alkyl, C3-8cyclcoalkyl, C3-8substituted cyclcoalkyl, C3-8heterocyclcoalkyl, or C3-8substituted heterocyclcoalkyl;Z and Y are each independently N; CRhwherein Rh= H, C1-3alkyl, or absent; or, if R1is attached to Z, then Z is C and Y is N or CRhwherein Rhis H or C1-3alkyl; or if R1is attached to Y, then Y is C and Z is N or CRhwherein Rhis H or C1-3alkyl;B is an optionally substituted 5-7 membered cycloalkyl ring, an optionally substituted 5-7 membered heteroaryl ring, or an optionally substituted 5-7 membered heterocyclic ring, wherein ring B is fused to ring G through Y and Z;ULM is a small molecule E3 Ubiquitin Ligase binding moiety that binds a Von Hippel-Lindau E3 Ubiquitin Ligase or a Cereblon E3 Ubiquitin Ligase;L’ is a linker precursor of Formula (iii)(iii), whereinM’ is selected from the group consisting of:wherein each Rm1and Rm2is independently hydrogen, halogen, or -S-Ph;Rm3and Rm4are each halogen;Rb1and Rb2are each independently hydrogen or C1-C6alkyl, or Rb1and Rb2together with the carbon to which they are attached form a C4-C6cycloalkyl or a C4-C6heterocycloalkyl;Rb3and Rb4are each independently hydrogen or C1-C6alkyl, subscript si is 0 or 1; wherein the wavy line of M’ indicates the point of covalent attachment to the remainder of the structure of L’ and the wavy line of Formula (iii) indicates the point of covalent attachment to the degrader compound (D); andU is absent or is -(CH2)b(Rv1)ss(C=O)u(NH)v- wherein subscript b is 0, 1, 2, 3, 4, or 5; subscript ss is 0 or 1; subscript u is 0 or 1; subscript v is 0 or 1;Rv1is -C3-C6cycloalkyl- or -C3-C6cycloalkyl-C(O)NHCH2-Rv2-, whereinRv2is C3-C6cycloalkyl, C3-C6heterocycle, or C3-C6heteroaryl; or-(CH2CH2O)wCH2CH2(NH)-, wherein subscript w is an integer ranging from1 to 16;X is absent or is-(CH2CH2O)wCH2CH2-(C=O)d- wherein subscript w is an integer ranging from 0 to 16 and subscript d is 0 or 1;-CH(Rx1)(CH2)nnC(O)-, wherein Rx1is hydrogen, -COOH, - C(O)NHCH3, or -(C(O)NHCH2)x(CH2OCH2)yRx2, wherein Rx2is - CH2NHC(O)CH3, - CH2NH2, or - CH2C(O)ORx2a, wherein Rx2ais hydrogen or C1-C6alkyl; subscript nn is an integer ranging from 1 to 6; subscript x and subscript y are each independently an integer ranging from 0 to 8;-C(O)-C(Rx3)(Rx4)-C(O)-, wherein Rx3and Rx4are independently hydrogen or C1-C6alkyl or Rx3and Rx4together with the carbon to which they are attached form a C3-C6cycloalkyl;-heterocycloalkyl-O(CH2)iC(O)-, wherein subscript i is an integer ranging from 0 to 6;-C(O)-C(Rx5)(Rx6)-OC(O)-, wherein Rx5is hydrogen or C1-C6alkyl and Rx6is hydrogen, C1-C6alkyl,wherein subscript f is an integer ranging from 0 to 4, and each Rx7is independently hydrogen, -COOH, -NH2, C1-C6alkyl, or an independently selected side chain of an amino acid; or-(CH2CH2O)yyCH2CH2NHC(O)CH2OCH2C(O) -, wherein subscript yy is an integer ranging from 0 to 16;YY is a branching unit selected from the group consisting of:wherein each qq is independently -N(Ry1)- or -O-, wherein Ry1is hydrogen or C1-C6alkyl; the wavy line indicates the point of attachment to X, when present, or U, when X is absent, or M’, when X and U are absent; and each dashed line indicates the point of attachment to ZZ when ZZ is present, or A A when ZZ is absent, or J when AA and ZZ are absent, or G when A A, ZZ, and J are absent; each ZZ is independently -(CH2CH2O)wCH2CH2C(O)-, wherein subscript w’ is an integer ranging from 0 to 16; each AA is independently absent or has the structure of:wherein subscript c is an integer ranging from 1 to 12; each Ra1is independently -COOH, -NH2, or an independently selected side chain of an amino acid; each J is independently absent, -(Rj3)N(C(Rj1)(Rj2))m1, or has the structure of.wherein Rj3is hydrogen, C1-C6alkyl, or C3-C6cycloalkyl;each Rj1and Rj2is independently hydrogen, C1-C6alkyl, C3-C6cycloalkyl, - OH, or -NRj4Rj5, wherein Rj4and Rj5are each -OH or C1-C6alkyl; subscript ml is an integer ranging from 1 to 6; each Rjis independently halogen, C1-C6alkyl, or -C(O)NH(C1-C6alkyl); subscript k is an integer ranging from 0 to 4; each G is independently absent,; and wherein the wavy line to each G of Formula (iii) indicates the point of covalent attachment to D.BRIEF DESCRIPTION OF THE DRAWINGS

[0016] FIGS. 1 A and IB show evaluation of anti-tumor activity (e.g., tumor growth inhibition) of Compound 1 and Compound 2 against PSMA+ prostate cancer cell line derived xenograft tumors (LNCaP) in CB17 SCID male mice and associated percent change in body weight, respectively.

[0017] FIGS. 2A-2C show analysis of SMARCA2 and SMARCA4 expression by Western blot.

[0018] FIGS. 3A-3B show evaluation of anti-tumor activity (e.g., tumor growth inhibition) of Compound 1 (squares), Compound 2 (triangles), and a vehicle (circles) against PSMA- prostate cancer cell line derived xenograft tumors (PC3) in BALC / c nude mice and associated percent change in body weight, respectively.

[0019] FIG. 4 shows anti-tumor activity (e.g., tumor growth inhibition) of Compound 3 and a comparator compound against PSMA+ prostate cancer cell line derived xenograft tumors (LNCaP) in CB17 SCID male mice.

[0020] FIG. 5 A shows a1H-NMR (400 MHz, DMSO-d6) spectrum of Compound 2.63.

[0021] FIG. 5B shows a1H-NMR (400 MHz, DMSO-d6) spectrum of Compound 2.65.

[0022] FIG. 5C shows a1H-NMR (400 MHz, DMSO-d6) spectrum of Compound 2.69.DETAILED DESCRIPTION OF THE INVENTION

[0023] Provided herein are antibody-drug conjugates that can target SMARCA2 and / or SMARCA4 and may be used in treatment of conditions such as cancer and autoimmune diseases.Definitions

[0024] The following description is presented to enable a person of ordinary skill in the art to make and use the various embodiments. Various modifications to the examples described herein will be readily apparent to those of ordinary skill in the art, and the general principles defined herein may be applied to other examples and applications without departing from the spirit and scope of the various embodiments. Thus, the various embodiments are not intended to be limited to the examples described herein and shown, but are to be accorded the scope consistent with the claims.

[0025] Reference to “about” a value or parameter herein includes (and describes) embodiments that are directed to that value or parameter per se. For example, description referring to “about X” includes description of “X”. In some embodiments, the term “about” when used in association with a measurement, or used to modify a value, a unit, a constant, or a range of values, refers to variations of + / - 2%.

[0026] Reference to “between” two values or parameters herein includes (and describes) embodiments that include those two values or parameters per se. For example, description referring to “between x and y” includes description of “x” and “y” per se.

[0027] It is understood that aspects and variations described herein also include “consisting of’ and / or “consisting essentially of’ aspects and variations.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. The terminology used in the description is for describing particular embodiments only and is not intended to be limiting of the disclosure.

[0029] Where a range of values is provided, it is understood that each intervening value, to the tenth of the unit of the lower limit unless the context clearly dictates otherwise (such as in the case of a group containing a number of carbon atoms in which case each carbon atom number falling within the range is provided), between the upper and lower limit of that range and any other stated or intervening value in that stated range is encompassed within the disclosure. The upper and lower limits of these recited ranges are included in the range.

[0030] The articles “a” and “an” as used herein and in the appended claims are used herein to refer to one or to more than one (e.g., to at least one) of the grammatical object of the article unless the context clearly indicates otherwise. By way of example, “an element” means one element or more than one element.

[0031] The terms “co-administration” and “co-administering” or “combination therapy” refer to both concurrent administration (administration of two or more therapeutic agents at the same time) and time varied administration (administration of one or more therapeutic agents at a time different from that of the administration of an additional therapeutic agent or agents), as long as the therapeutic agents are present in the patient to some extent, preferably at effective amounts, at the same time. In certain aspects, one or more of the present conjugates described herein, are co-administered in combination with at least one additional bioactive agent, especially including an anti cancer agent. In certain aspects, the coadministration of compounds results in synergistic activity and / or therapy, including anticancer activity.

[0032] The term “compound”, as used herein, unless otherwise indicated, refers to any specific chemical compound disclosed herein and includes tautomers, regioisomers, geometric isomers, and where applicable, stereoisomers, including optical isomers (enantiomers) and other stereoisomers (diastereomers) thereof, as well as pharmaceutically acceptable salts and derivatives, including prodrug and / or deuterated forms thereof where applicable, in context. Deuterated small molecules contemplated are those in which one or more of the hydrogen atoms contained in the drug molecule have been replaced by deuterium. In some embodiments, “compound” refers to a degrader compound described herein, including tautomers, regioisomers, geometric isomers, and where applicable, stereoisomers, including optical isomers (enantiomers) and other stereoisomers (diastereomers) thereof, as well as pharmaceutically acceptable salts and derivatives, including prodrug and / or deuterated forms thereof where applicable, in context.

[0033] Within its use in context, the term compound generally refers to a single compound, but also may include other compounds such as stereoisomers, regioisomers and / or optical isomers (including racemic mixtures) as well as specific enantiomers or enantiomerically enriched mixtures of disclosed compounds. The term also refers, in some embodiments, to prodrug forms of compounds which have been modified to facilitate the administration and delivery of compounds to a site of activity. It is noted that in describing the present compounds, numerous substituents and variables associated with same, among others, are described. It is understood by those of ordinary skill that molecules which are described herein are stable compounds as generally described hereunder.

[0034] The term “conjugate”, as used herein, unless otherwise indicated, refers to any specific antibody-drug conjugate disclosed herein, as well as pharmaceutically acceptablesalts and derivatives thereof. In some instances, the term “conjugate” includes compositions and pharmaceutically acceptable compositions of antibody-drug conjugates described herein.

[0035] The term “ubiquitin ligase” refers to a family of proteins that facilitate the transfer of ubiquitin to a specific substrate protein, targeting the substrate protein for degradation. For example, an E3 ubiquitin ligase protein that alone or in combination with an E2 ubiquitin- conjugating enzyme causes the attachment of ubiquitin to a lysine on a target protein, and subsequently targets the specific protein substrates for degradation by the proteasome. Thus, E3 ubiquitin ligase alone or in complex with an E2 ubiquitin conjugating enzyme is responsible for the transfer of ubiquitin to targeted proteins. In general, the ubiquitin ligase is involved in polyubiquitination such that a second ubiquitin is attached to the first; a third is attached to the second, and so forth. Polyubiquitination marks proteins for degradation by the proteasome. However, there are some ubiquitination events that are limited to mono- ubiquitination, in which only a single ubiquitin is added by the ubiquitin ligase to a substrate molecule. Mono-ubiquitinated proteins are not targeted to the proteasome for degradation, but may instead be altered in their cellular location or function, for example, via binding other proteins that have domains capable of binding ubiquitin. Further complicating matters, different lysines on ubiquitin can be targeted by an E3 to make chains. The most common lysine is Lys48 on the ubiquitin chain. This is the lysine used to make polyubiquitin, which is recognized by the proteasome.

[0036] As used herein, “Von Hippel-Lindau (VHL) E3 Ubiquitin Ligase” and “Cereblon (CRBN) E3 Ubiquitin Ligase” refer to the substrate recognition subunit of Cullin RING E3 ubiquitin ligase complexes. Both VHL and CRBN are popular E3 ligases recruited by bifunctional Proteolysis-targeting chimeras (PROTACs) to induce ubiquitination and subsequent proteasomal degradation of a target protein (Girardini, M. et al., Bioorg Med Chem. 2019, 27(12): 2466-2479).

[0037] As used herein, the term “alkyl”, by itself or as part of another substituent, means, unless otherwise stated, a straight or branched chain hydrocarbon radical having up to twelve carbon atoms. In some embodiments, the number of carbon atoms is designated (i.e., C1-C8means one to eight carbons). Examples of alkyl groups include methyl, ethyl, n-propyl, isopropyl, n-butyl, t-butyl, iso-butyl, sec-butyl, n-pentyl, n-hexyl, n-heptyl, n-octyl, and the like. Alkyl groups may be optionally substituted as provided herein. In some embodiments, the alkyl group is a C1-C6alkyl; in some embodiments, it is a C1-C4alkyl.

[0038] When a range of carbon atoms is used herein, for example, C1-C6, all ranges, as well as individual numbers of carbon atoms are encompassed. For example, “C1-C3” includes C1- C3, C1-C2, C2-C3, C1, C2, and C3.

[0039] The term “optionally substituted”, as used in combination with a substituent defined herein, means that the substituent may, but is not required to, have one or more hydrogens replaced with one or more suitable functional groups or other substituents as provided herein. For example, a substituent may be optionally substituted with one or more of: -H, D, -halo, - C1-C8alkyl, -O-C1-C8alkyl, -C1-C6haloalkyl, -S-C1-C8alkyl,-NHC1-C8alkyl, -N(C1-C8alkyl)2, 3-11 membered cycloalkyl, aryl, heteroaryl, 3-11 membered heterocyclyl, -O-(3-11 membered cycloalkyl), -S-(3-11 membered cycloalkyl), NH-(3-11 membered cycloalkyl), N(3-11 membered cycloalkyl)2, N-(3-11 membered cycloalkyl)(C1-C8alkyl), -OH, -NH2, - SH, -SO2C1-C8alkyl, SO(NH)C1-C8alkyl, P(O)(OC1-C8alkyl)(C1-C8alkyl), -P(O)(OC1- C8alkyl)2, -C=C-C1-C8alkyl, -C=CH, -CH=CH(C1-C8alkyl), -C(C1-C8alkyl)=CH(C1-C8alkyl), -C(C1-C8alkyl)=C(C1-C8alkyl)2, -Si(OH)3, -Si(C1-C8alkyl)3, -Si(OH)(C1-C8alkyl)2, -C(O)C1- C8alkyl, -CO2H, -CN, -CF3, -CHF2, -CH2F, -NO2, -SF5, -SO2NHC1-C8alkyl, -SO2N(C1- C8alkyl)2, -SO(NH)NHC1-C8alkyl, -SO(NH)N(C1-C8alkyl)2, -SONHC1-C8alkyl, -SON(C1- C8alkyl)2, -CONHC1-C8alkyl, -CON(C1-C8alkyl)2, -N(C1-C8alkyl)CONH(C1-C8alkyl), -N(C1- C8alkyl)CON(C1-C8alkyl)2, -NHCONH(C1-C8alkyl), -NHCON(C1-C8alkyl)2, -NHCONH2, - N(C1-C8alkyl)SO2NH(C1-C8alkyl), -N(C1-C8alkyl)SO2N(C1-C8alkyl)2, -NHSO2NH(CI- C8alkyl), -NHSO2N(C1-C8alkyl)2, or -NHSO2NH2. In some embodiments, each of the above optional substituents are themselves optionally substituted by one or two groups.

[0040] The term “optionally substituted -CH2-,” refers to “-CH2-” or “substituted -CH2- ” A substituted -CH2- may also be referred to as -CH( substituent)- or -C(substituent)(substituent)- , wherein each substituent is independently selected from the optional substituents described herein.

[0041] The term “cycloalkyl” as used herein refers to a 3-12 membered cyclic alkyl group, and includes bridged and spirocycles (e.g., adamantine). Cycloalkyl groups may be fully saturated or partially unsaturated. The term “cycloalkyl” also includes multiple condensed ring systems (e.g., ring systems comprising 2, 3 or 4 rings) wherein a single cycloalkyl ring (as defined above) can be condensed with one or more groups selected from heterocycles, carbocycles, aryls, or heteroaryls to form the multiple condensed ring system. Such multiple condensed ring systems may be optionally substituted with one or more (e.g., 1, 2, 3 or 4) oxo groups on the carbocycle or heterocycle portions of the multiple condensed ring. The rings of the multiple condensed ring system can be connected to each other via fused, spiro andbridged bonds when allowed by valency requirements. It is to be understood that the individual rings of the multiple condensed ring system may be connected in any order relative to one another. It is also to be understood that the point of attachment of a multiple condensed ring system (as defined above for a cycloalkyl) can be at any position of the cycloalkylic ring. Examples of cycloalkyl groups include cyclopropyl, cyclobutyl, cyclopentyl, cycloheptyl, cyclohexyl, cycloheptyl, cyclooctyl, indenyl, bicyclo[2.2.1]heptanyl, bicyclo[3.1.1]heptanyl, bicyclo[4.1.0]heptanyl, spiro[3.3] heptanyl, and spiro[3.4]octanyl. In some embodiments, the cycloalkyl group is a 3-7 membered cycloalkyl.

[0042] The term “alkenyl” as used herein refers to C2-C12alkyl group that contains at least one carbon-carbon double bond. In some embodiments, the alkenyl group is optionally substituted. In some embodiments, the alkenyl group is a C2-C6alkenyl.

[0043] The term “akynyl” as used herein refers to C2-C12alkyl group that contains at least one carbon-carbon triple bond. In some embodiments, the alkenyl group is optionally substituted. In some embodiments, the alkynyl group is a C2-C6alkynyl.

[0044] The terms “alkoxy,” “alkylamino” and “alkylthio”, are used in their conventional sense, and refer to those alkyl groups attached to the remainder of the molecule via an oxygen atom (“oxy”), an amino group (“amino”) or thio group. The term “alkylamino” includes mono- di-alkylamino groups, the alkyl portions can be the same or different.

[0045] The terms “halo” or “halogen”, by itself or as part of another substituent, means a fluorine, chlorine, bromine, or iodine atom.

[0046] The term “heteroalkyl” refers to an alkyl group in which one or more carbon atom has been replaced by a heteroatom selected from S, O, P and N. Exemplary heteroalkyls include alkyl ethers, secondary and tertiary alkyl amines, alkyl amides, alkyl sulfides, and the like. The group may be a terminal group or a bridging group. As used herein reference to the normal chain when used in the context of a bridging group refers to the direct chain of atoms linking the two terminal positions of the bridging group.

[0047] The term “aryl” as used herein refers to a single, all carbon aromatic ring or a multiple condensed all carbon ring system wherein at least one of the rings is aromatic. For example, in certain embodiments, an aryl group has 6 to 12 carbon atoms. Aryl includes a phenyl radical. Aryl also includes multiple condensed ring systems (e.g., ring systems comprising 2, 3 or 4 rings) having about 9 to 12 carbon atoms in which at least one ring is aromatic and wherein the other rings may be aromatic or not aromatic. Such multiple condensed ring systems are optionally substituted with one or more (e.g., 1, 2 or 3) oxo groups on anycarbocycle portion of the multiple condensed ring system. The rings of the multiple condensed ring system can be connected to each other via fused, spiro and bridged bonds when allowed by valency requirements. It is to be understood that the point of attachment of a multiple condensed ring system, as defined above, can be at any position of the aromatic ring. Non-limiting examples of aryl groups include, but are not limited to, phenyl, indenyl, naphthyl, 1, 2, 3, 4-tetrahydronaphth-yl, and the like.

[0048] The term “Ph” as used herein refers to phenyl.

[0049] The term “heteroaryl” as used herein refers to a single aromatic ring that has at least one atom other than carbon in the ring, wherein the atoms are selected from the group consisting of oxygen, nitrogen and sulfur; “heteroaryl” also includes multiple condensed ring systems that have at least one such aromatic ring, which multiple condensed ring systems are further described below. Thus, “heteroaryl” includes single aromatic rings of from about 1 to 6 carbon atoms and about 1-4 heteroatoms selected from the group consisting of oxygen, nitrogen and sulfur. The sulfur and nitrogen atoms may also be present in an oxidized form provided the ring is aromatic. Exemplary heteroaryl ring systems include but are not limited to pyridyl, pyrimidinyl, oxazolyl or furyl. “Heteroaryl” also includes multiple condensed ring systems (e.g., ring systems comprising 2, 3 or 4 rings) wherein a heteroaryl group, as defined above, is condensed with one or more rings selected from heteroaryls (to form for example a naphthyridinyl such as 1,8-naphthyridinyl), heterocycles, (to form for example a 1, 2, 3, 4- tetra-hydronaphthyridinyl such as 1,2, 3, 4-tetrahydro- 1,8-naphthyridinyl), carbocycles (to form for example 5,6,7,8-tetrahydroquinolyl) and aryls (to form for example indazolyl) to form the multiple condensed ring system. Thus, a heteroaryl (a single aromatic ring or multiple condensed ring system) has about 1-20 carbon atoms and about 1-6 heteroatoms within the heteroaryl ring. A heteroaryl (a single aromatic ring or multiple condensed ring system) can also have about 5 to 12 or about 5 to 10 members within the heteroaryl ring. Multiple condensed ring systems may be optionally substituted with one or more (e.g., 1, 2, 3 or 4) oxo groups on the carbocycle or heterocycle portions of the condensed ring. The rings of a multiple condensed ring system can be connected to each other via fused, spiro and bridged bonds when allowed by valency requirements. It is to be understood that the individual rings of the multiple condensed ring system may be connected in any order relative to one another. It is also to be understood that the point of attachment of a multiple condensed ring system (as defined above for a heteroaryl) can be at any position of the heteroaryl ring. It is also to be understood that the point of attachment for a heteroaryl or heteroaryl multiple condensed ring system can be at any suitable atom of the heteroaryl ring including a carbonatom and a heteroatom (e.g., a nitrogen). Exemplary heteroaryls include but are not limited to pyridyl, pyrrolyl, pyrazinyl, pyrimidinyl, pyridazinyl, pyrazolyl, thienyl, indolyl, imidazolyl, oxazolyl, isoxazolyl, thiazolyl, furyl, oxadiazolyl, thiadiazolyl, quinolyl, isoquinolyl, benzothiazolyl, benzoxazolyl, indazolyl, quinoxalyl, quinazolyl, 5, 6,7,8- tetrahydroisoquinolinyl benzofuranyl, benzimidazolyl, thianaphthenyl, pyrrolo[2,3- b]pyridinyl, quinazolinyl-4(3H)-one, triazolyl, 4,5,6,7-tetrahydro-lH-indazole and 3b, 4,4a, 5- tetrahydro-lH-cyclopropa[3,4]cyclo-penta[l,2-c]pyrazole. In one embodiment the term “heteroaryl” refers to a single aromatic ring containing at least one heteroatom. For example, the term includes 5-membered and 6-membered monocyclic aromatic rings that include one or more heteroatoms. Non-limiting examples of heteroaryl include but are not limited to pyridyl, furyl, thiazole, pyrimidine, oxazole, and thiadiazole.

[0050] The term “heterocyclyl” or “heterocycle” as used herein refers to a single saturated or partially unsaturated ring that has at least one atom other than carbon in the ring, wherein the atom is selected from the group consisting of oxygen, nitrogen and sulfur; the term also includes multiple condensed ring systems that have at least one such saturated or partially unsaturated ring, which multiple condensed ring systems are further described below. Thus, the term includes single saturated or partially unsaturated rings (e.g., 3, 4, 5, 6 or 7-membered rings) from about 1 to 6 carbon atoms and from about 1 to 3 heteroatoms selected from the group consisting of oxygen, nitrogen and sulfur in the ring. The ring may be substituted with one or more (e.g., 1, 2 or 3) oxo groups and the sulfur and nitrogen atoms may also be present in their oxidized forms. Exemplary heterocycles include but are not limited to azetidinyl, tetrahydrofuranyl and piperidinyl. The term “heterocycle” also includes multiple condensed ring systems (e.g., ring systems comprising 2, 3 or 4 rings) wherein a single heterocycle ring (as defined above) can be condensed with one or more groups selected from heterocycles (to form for example a 1,8-decahydronapthyridinyl), carbocycles (to form for example a decahydroquinolyl) and aryls to form the multiple condensed ring system. Thus, a heterocycle (a single saturated or single partially unsaturated ring or multiple condensed ring system) has about 2-20 carbon atoms and 1-6 heteroatoms within the heterocycle ring. Such multiple condensed ring systems may be optionally substituted with one or more (e.g., 1, 2, 3 or 4) oxo groups on the carbocycle or heterocycle portions of the multiple condensed ring. The rings of the multiple condensed ring system can be connected to each other via fused, spiro and bridged bonds when allowed by valency requirements. It is to be understood that the individual rings of the multiple condensed ring system may be connected in any order relative to one another. Accordingly, a heterocycle (a single saturated or single partiallyunsaturated ring or multiple condensed ring system) has about 3-20 atoms including about 1- 6 heteroatoms within the heterocycle ring system. It is also to be understood that the point of attachment of a multiple condensed ring system (as defined above for a heterocylyl) can be at any position of the heterocyclic ring. It is also to be understood that the point of attachment for a heterocycle or heterocycle multiple condensed ring system can be at any suitable atom of the heterocyclic ring including a carbon atom and a heteroatom (e.g., a nitrogen). In one embodiment the term heterocycle includes a C2-20heterocycle. In one embodiment the term heterocycle includes a C2-7heterocycle. In one embodiment the term heterocycle includes a C2-5heterocycle. In one embodiment the term heterocycle includes a C2-4heterocycle. Exemplary heterocycles include, but are not limited to aziridinyl, azetidinyl, pyrrolidinyl, piperidinyl, homopiperidinyl, morpholinyl, thiomorpholinyl, piperazinyl, tetrahydrofuranyl, dihydrooxazolyl, tetrahydropyranyl, tetrahydrothiopyranyl, 1,2,3,4-tetrahydro-quinolyl, benzoxazinyl, dihydrooxazolyl, chromanyl, 1,2-dihydropyridinyl, 2,3-dihydrobenzo-furanyl, 1,3-benzodioxolyl, 1,4-benzodioxanyl, spiro[cyclopropane-1, 1'-isoindolinyl]-3'-one, isoindolinyl-l-one, 2-oxa-6-azaspiro[3.3]heptanyl, imidazolidin-2-one N-methylpiperidine, imidazolidine, pyrazolidine, butyrolactam, valerolactam, imidazolidinone, hydantoin, di oxolane, phthalimide, 1,4-di oxane, thiomorpholine, thiomorpholine-S-oxide, thiomorpholine-S,S-oxide, pyran, 3-pyrroline, thiopyran, pyrone, tetrahydrothiophene, quinuclidine, tropane, 2-azaspiro[3.3]- heptane, (lR,5S)-3-azabicyclo[3.2.1]octane, (ls,4s)-2- azabicyclo[2.2.2]octane, (lR,4R )-2-oxa-5-azabicyclo[2.2.2]octane and pyrrolidin-2-one. In one embodiment the term “heterocycle” refers to a monocyclic, saturated or partially unsaturated, 3-8 membered ring having at least one heteroatom. For example, the term includes a monocyclic, saturated or partially unsaturated, 4, 5, 6, or 7 membered ring having at least one heteroatom. Non-limiting examples of heterocycle include aziridine, azetidine, pyrrolidine, piperidine, piperidine, piperazine, oxirane, morpholine, and thiomorpholine. The term “9- or 10-membered heterobicycle” as used herein refers to a partially unsaturated or aromatic fused bicyclic ring system having at least one heteroatom. For example, the term 9- or 10-membered heterobicycle includes a bicyclic ring system having a benzo ring fused to a 5-membered or 6-membered saturated, partially unsaturated, or aromatic ring that contains one or more heteroatoms.

[0051] As used herein, the term “heteroatom” is meant to include oxygen (O), nitrogen (N), sulfur (S) and silicon (Si). The nitrogen and sulfur can be in an oxidized form when feasible.

[0052] A “branching unit” as used herein refers to a chemical moiety that comprises at least three attachment sites (e.g., at least trifunctional). For example, an at least tri -substitutedcarbocycle, an at least tri -substituted heterocycle, a tertiary carbon atom, and a tertiary nitrogen atom can serve as a branching unit. In some embodiments, the branching unit comprises at least three functional groups independently selected from an amine, a carboxylate, a thiocarboxylate, hydroxyl, thiol, carbamate, thiocarbamate, sulfonate, sulfonamide, phosphonate, and phosphinate. The branching unit is typically present when more than one degrader compounds, as described herein, is to be conjugated to a linker or a linker precursor, as described herein. However, a branching unit can also be used to conjugate only one degrader compound to a linker or only one degrader to a linker precursor, as described herein. In some embodiments, a branching unit comprises three attachment sites.

[0053] As used herein, the term “stereoisomers” refers to compounds which have identical chemical constitution but differ with regard to the arrangement of the atoms or groups in space, e.g., enantiomers, diastereomers, tautomers.

[0054] The term “patient” or “subject” is used throughout the specification to describe an animal, preferably a human or a domesticated animal, to whom treatment, including prophylactic treatment, with the compositions according to the present disclosure is provided. For treatment of those infections, conditions or disease states which are specific for a specific animal such as a human patient, the term patient refers to that specific animal, including a domesticated animal such as a dog or cat or a farm animal such as a horse, cow, sheep, etc. In general, in the present disclosure, the term patient refers to a human patient unless otherwise stated or implied from the context of the use of the term.

[0055] The term “effective” is used to describe an amount of a compound, composition, conjugate, or component which, when used within the context of its intended use, effects an intended result. The term effective subsumes all other effective amount or effective concentration terms, which are otherwise described or used in the present application.

[0056] “Pharmaceutically acceptable” means approved or approvable by a regulatory agency of the Federal or a state government or the corresponding agency in countries other than the United States, or that is listed in the U.S. Pharmacopoeia or other generally recognized pharmacopoeia for use in animals, e.g., in humans.

[0057] “Pharmaceutically acceptable salt” refers to a salt of a compound or a conjugate of the disclosure that is pharmaceutically acceptable and that possesses the desired pharmacological activity of the parent compound or conjugate. In particular, such salts are non-toxic may be inorganic or organic acid addition salts and base addition salts. Specifically, such salts include: (1) acid addition salts, formed with inorganic acids such as hydrochloric acid, hydrobromic acid, sulfuric acid, nitric acid, phosphoric acid, and the like; or formed withorganic acids such as acetic acid, propionic acid, hexanoic acid, cyclopentanepropionic acid, glycolic acid, pyruvic acid, lactic acid, malonic acid, succinic acid, malic acid, maleic acid, fumaric acid, tartaric acid, citric acid, benzoic acid, 3-(4-hydroxybenzoyl)benzoic acid, cinnamic acid, mandelic acid, methanesulfonic acid, ethanesulfonic acid, 1,2-ethane- disulfonic acid, 2-hydroxyethanesulfonic acid, benzenesulfonic acid, 4- chlorobenzenesulfonic acid, 2-naphthalenesulfonic acid, 4-toluenesulfonic acid, camphorsulfonic acid, 4-methylbicyclo[2.2.2]-oct-2-ene-l -carboxylic acid, glucoheptonic acid, 3 -phenylpropionic acid, trimethylacetic acid, tertiary butylacetic acid, lauryl sulfuric acid, gluconic acid, glutamic acid, hydroxynaphthoic acid, salicylic acid, stearic acid, muconic acid, and the like; or (2) salts formed when an acidic proton present in the parent compound or conjugate either is replaced by a metal ion, e.g., an alkali metal ion, an alkaline earth ion, or an aluminum ion; or coordinates with an organic base such as ethanolamine, diethanolamine, triethanolamine, N-methylglucamine and the like. Salts further include, by way of example only, sodium, potassium, calcium, magnesium, ammonium, tetraalkylammonium, and the like; and when the compound or conjugate contains a basic functionality, salts of non-toxic organic or inorganic acids, such as hydrochloride, hydrobromide, tartrate, mesylate, acetate, maleate, oxalate and the like.

[0058] A “pharmaceutically acceptable excipient” refers to a substance that is non-toxic, biologically tolerable, and otherwise biologically suitable for administration to a subject, such as an inert substance, added to a pharmacological composition or otherwise used as a vehicle, carrier, or diluent to facilitate administration of an agent and that is compatible therewith. Examples of excipients include calcium carbonate, calcium phosphate, various sugars and types of starch, cellulose derivatives, gelatin, vegetable oils, and polyethylene glycols.

[0059] A “solvate” refers to a physical association of a compound of Formula I with one or more solvent molecules.

[0060] “Treating” or “treatment” of any disease or disorder refers, in one embodiment, to ameliorating the disease or disorder (e.g., arresting or reducing the development of the disease or at least one of the clinical symptoms thereof). In another embodiment “treating” or “treatment” refers to ameliorating at least one physical parameter, which may not be discernible by the subject. In yet another embodiment, “treating” or “treatment” refers to modulating the disease or disorder, either physically, (e.g., stabilization of a discernible symptom), physiologically, (e.g., stabilization of a physical parameter), or both. In yet another embodiment, “treating” or “treatment” refers to delaying the onset of the disease or disorder. As used herein, including the appended claims, the singular forms of words such as“a,” “an,” and “the,” include their corresponding plural references unless the context clearly dictates otherwise.

[0061] An “antibody-drug conjugate” or “ADC” refers to an antibody conjugated to a drug moiety, such as a cytotoxic agent. Typically, an ADC binds to a target antigen on a cell surface, followed by internalization of the ADC into the cell and subsequent release of the drug into the cell. In some embodiments, the target antigen is PSMA, CD33, HER2, Trop-2, HER3, B7H3, B7H4, CEACAM5, MET, NECTIN4, CALR, or CD123.

[0062] The term “drug loading”, “drug-antibody ratio” or “DAR” used herein is the average number of drug moieties conjugated to each individual antibody.

[0063] A “protein” is a macromolecule comprising one or more polypeptide chains. A protein may also comprise non-peptidic components, such as carbohydrate groups. Carbohydrates and other non-peptidic substituents may be added to a protein by the cell in which the protein is produced, and will vary with the type of cell. Proteins are defined herein in terms of their amino acid backbone structures. Substituents such as carbohydrate groups are generally not specified, but may be present nonetheless.

[0064] Percentage sequence identities are determined with antibody sequences maximally aligned by the Kabat numbering convention. After alignment, if a subject antibody region (e.g., the entire variable domain of a heavy or light chain) is being compared with the same region of a reference antibody, the percentage sequence identity between the subject and reference antibody regions is the number of positions occupied by the same amino acid in both the subject and reference antibody region divided by the total number of aligned positions of the two regions, with gaps not counted, multiplied by 100 to convert to percentage.

[0065] Compositions or methods “comprising” one or more recited elements may include other elements not specifically recited. For example, a composition that comprises antibody may contain the antibody alone or in combination with other ingredients.

[0066] In antibodies or other proteins described herein, reference to amino acid residues corresponding to those specified by sequence identification number (i.e., SEQ ID NO) includes post-translational modifications of such residues.

[0067] “Sequence identity” is defined as the percentage of residues in the amino acid sequence variant that are identical after aligning the sequences and introducing gaps, if necessary, to achieve the maximum percent sequence identity. Methods and computer programs for the alignment are well known in the art. One such computer program is “Align2,” authored by Genentech, Inc., which was filed with user documentation in the United States Copyright Office, Washington, D.C. 20559, on Dec. 10, 1991.

[0068] The term “antibody” denotes immunoglobulin proteins produced by the body in response to the presence of an antigen and that bind to the antigen, as well as antigen-binding fragments and engineered variants thereof. Hence, the term “antibody” includes, for example, full length antibodies as well as antigen-binding antibody fragments, such as a F(ab')2, a Fv fragment, a diabody, a single-chain antibody, an scFv fragment, or an scFv-Fc. Genetically, engineered antibodies and antibody fragments such as chimeric antibodies, humanized antibodies, fully human antibodies, single-chain Fv fragments, single-chain antibodies, diabodies, minibodies, linear antibodies, multivalent or multi-specific (e.g., bispecific) hybrid antibodies, and the like, are also included. The antibodies provided herein may be “half antibodies”, comprising a single light chain and a single heavy chain.

[0069] The term antibody or antigen-binding fragment thereof includes a “conjugated” antibody or antigen-binding fragment thereof or an “antibody -drug conjugate (ADC)” in which an antibody or antigen-binding fragment thereof is covalently or non-covalently bound to a pharmaceutical agent, e.g., to a drug moiety, such as a cytotoxic agent.

[0070] The term “genetically engineered antibodies” refers to an antibody in which the amino acid sequence has been varied from that of the native or parental antibody. The possible variations are many, and range from the changing of just one or a few amino acids to the complete redesign of, for example, the variable or constant region. Changes in the constant region are, in general, made to improve or alter characteristics such as, e.g., complement binding and other effector functions. Typically, changes in the variable region are made to improve antigen-binding characteristics, improve variable region stability, and / or reduce the risk of immunogenicity.

[0071] The term “chimeric antibody” refers to an antibody in which a portion of the heavy and / or light chain is identical with or homologous to corresponding sequences in an antibody derived from a particular species (e.g., human) or belonging to a particular antibody class or subclass, while the remainder of the chain(s) is identical with or homologous to corresponding sequences in an antibody derived from another species (e.g., mouse) or belonging to another antibody class or subclass, as well as fragments of such antibodies, so long as they exhibit the desired biological activity.

[0072] The term “human” antibody or antigen-binding fragment thereof means an antibody or antigen-binding fragment thereof having an amino acid sequence derived from a human immunoglobulin gene locus, where such antibody or antigen-binding fragment is made usingtechniques known in the art. This definition of a human antibody or antigen-binding fragment thereof includes intact or full-length antibodies and fragments thereof.

[0073] An “antigen-binding site of an antibody” is that portion of an antibody that is sufficient to bind to its antigen. The minimum such region is typically a variable domain or a genetically engineered variant thereof. Single domain binding sites can be generated from camelid antibodies (see Muyldermans and Lauwereys, Mol. Recog. 12: 131-140, 1999; Nguyen et al., EMBO J. 19:921-930, 2000) or from VH domains of other species to produce single-domain antibodies (“dAbs,” see Ward et al., Nature 341 : 544-546, 1989; US Patent No. 6,248,516 to Winter et al). Commonly, an antigen-binding site of an antibody comprises both a heavy chain variable (VH) domain and a light chain variable (VL) domain that bind to a common epitope. Within the context of the present disclosure, an antibody may include one or more components in addition to an antigen-binding site, such as, for example, a second antigen-binding site of an antibody (which may bind to the same or a different epitope or to the same or a different antigen), a peptide linker, an immunoglobulin constant region, an immunoglobulin hinge, an amphipathic helix (see Pack and Pluckthun, Biochem. 31 : 1579- 1584, 1992), a non-peptide linker, an oligonucleotide (see Chaudri et al., FEBS Letters 450:23-26, 1999), a cytotoxic agent, and the like, and may be a monomeric or multimeric protein. Examples of molecules comprising an antigen-binding site of an antibody are known in the art and include, for example, Fv, single-chain Fv (scFv), Fab, Fab', F(ab')2, F(ab)c, diabodies, triabodies, tetrabodies, minibodies, nanobodies, single domain VNARs, Fab-scFv fusions, bispecific (scFv)4-IgG, and bispecific (scFv)2-Fab. (See, e.g., Hu et al., Cancer Res. 56:3055-3061, 1996; Atwell et al., Molecular Immunology 33: 1301-1312, 1996; Carter and Merchant, Curr. Op. Biotechnol. 8:449-454, 1997; Zuo et al., Protein Engineering 13:361- 367, 2000; and Lu et al., J. Immunol. Methods 267:213-226, 2002.)

[0074] The term “immunoglobulin” refers to a protein consisting of one or more polypeptides substantially encoded by immunoglobulin gene(s). One form of immunoglobulin constitutes the basic structural unit of native (i.e., natural or parental) antibodies in vertebrates. This form is a tetramer and consists of two identical pairs of immunoglobulin chains, each pair having one light chain and one heavy chain. In each pair, the light and heavy chain variable regions (VL and VH) are together primarily responsible for binding to an antigen, and the constant regions are primarily responsible for the antibody effector functions. Five classes of immunoglobulin protein (IgG, IgA, IgM, IgD, and IgE) have been identified in higher vertebrates. IgG comprises the major class, and it normally exists as the second most abundant protein found in plasma. In humans, IgG consists of four subclasses, designatedIgGl, IgG2, IgG3, and IgG4. Each immunoglobulin heavy chain possesses a constant region that consists of constant region protein domains (CHI, hinge, CH2, and CH3; IgG3 also contains a CH4 domain) that are essentially invariant for a given subclass in a species.

[0075] DNA sequences encoding human and non-human immunoglobulin chains are known in the art. (See, e.g., Ellison et al, DNA 1 : 11-18, 1981; Ellison et al, Nucleic Acids Res. 10:4071-4079, 1982; Kenten et al., Proc. Natl. Acad. Set USA 79:6661-6665, 1982; Seno et al., Nucl. Acids Res. 11 :719-726, 1983; Riechmann et al., Nature 332:323-327, 1988; Amster et al., Nucl. Acids Res. 8:2055-2065, 1980; Rusconi and Kohler, Nature 314:330- 334, 1985; Boss et al., Nucl. Acids Res. 12:3791-3806, 1984; Bothwell et al., Nature 298:380-382, 1982; van der Loo et al., Immunogenetics 42:333-341, 1995; Karlin et al., J. Mol. Evol. 22: 195-208, 1985; Kindsvogel et al., DNA 1 :335-343, 1982; Breiner et al., Gene 18: 165-174, 1982; Kondo et al., Eur. J. Immunol. 23:245-249, 1993; and GenBank Accession No. J00228.) For a review of immunoglobulin structure and function see Putnam, The Plasma Proteins, Vol V, Academic Press, Inc., 49-140, 1987; and Padlan, Mol. Immunol. 31 : 169-217, 1994.

[0076] Full-length immunoglobulin “light chains” (about 25 kDa or 214 amino acids) are encoded by a variable region gene at the amino-terminus (encoding about 110 amino acids) and a by a kappa or lambda constant region gene at the carboxyl-terminus. Full-length immunoglobulin “heavy chains” (about 50 kDa or 446 amino acids) are encoded by a variable region gene (encoding about 116 amino acids) and a gamma, mu, alpha, delta, or epsilon constant region gene (encoding about 330 amino acids), the latter defining the antibody’s isotype as IgG, IgM, IgA, IgD, or IgE, respectively. Within light and heavy chains, the variable and constant regions are joined by a “J” region of about 12 or more amino acids, with the heavy chain also including a “D” region of about 10 more amino acids. (See generally Fundamental Immunology (Paul, ed., Raven Press, N.Y., 2nd ed. 1989), Ch. 7).

[0077] An immunoglobulin light or heavy chain variable region (also referred to herein as a “light chain variable domain” (“VL domain”) or “heavy chain variable domain” (“VH domain”), respectively) consists of a “framework” region and three “complementarity determining regions” or “CDRs.” The framework regions align the CDRs for specific binding to an epitope of an antigen. Thus, the term “CDR” refers to the amino acid residues of an antibody that are primarily responsible for antigen binding. From amino-terminus to carboxyl-terminus, both VL and VH domains comprise the following framework (FR) and CDR regions: FR1, CDR1, FR2, CDR2, FR3, CDR3, FR4.

[0078] The assignment of amino acids to each variable region domain is in accordance with the definitions of Kabat, Sequences of Proteins of Immunological Interest (National Institutes of Health, Bethesda, MD, 1987 and 1991). Kabat also provides a widely used numbering convention (Kabat numbering) in which corresponding residues between different heavy chain variable regions or between different light chain variable regions are assigned the same number. CDRs 1, 2 and 3 of a VL domain are also referred to herein, respectively, as CDR- Ll, CDR-L2 and CDR-L3. CDRs 1, 2 and 3 of a VH domain are also referred to herein, respectively, as CDR-H1, CDR-H2 and CDR-H3. If so noted, the assignment of CDRs can be in accordance with IMGT® (Lefranc et al., Developmental & Comparative Immunology 27:55-77; 2003) in lieu of Kabat.

[0079] Numbering of the heavy chain constant region is via the EU index as set forth in Kabat (Kabat, Sequences of Proteins of Immunological Interest, National Institutes of Health, Bethesda, MD, 1987 and 1991).

[0080] Unless the context dictates otherwise, the term “monoclonal antibody” is not limited to antibodies produced through hybridoma technology. The term “monoclonal antibody” can include an antibody that is derived from a single clone, including any eukaryotic, prokaryotic or phage clone. In particular embodiments, the antibodies described herein are monoclonal antibodies.

[0081] A “humanized antibody” is an antibody comprising one or both of a humanized VH domain and a humanized VL domain. Immunoglobulin constant region(s) need not be present, but if they are, they are entirely or substantially from human immunoglobulin constant regions.

[0082] A humanized antibody is a genetically engineered antibody in which the CDRs from a non-human “donor” antibody are grafted into human “acceptor” antibody sequences (see, e.g., Queen, US 5,530,101 and 5,585,089; Winter, US 5,225,539; Carter, US 6,407,213; Adair, US 5,859,205; and Foote, US 6,881,557). The acceptor antibody sequences can be, for example, a mature human antibody sequence, a composite of such sequences, a consensus sequence of human antibody sequences, or a germline region sequence.

[0083] Human acceptor sequences can be selected for a high degree of sequence identity in the variable region frameworks with donor sequences to match canonical forms between acceptor and donor CDRs among other criteria. Thus, a humanized antibody is an antibody having CDRs entirely or substantially from a donor antibody and variable region framework sequences and constant regions, if present, entirely or substantially from human antibody sequences. Similarly, a humanized heavy chain typically has all three CDRs entirely orsubstantially from a donor antibody heavy chain, and a heavy chain variable region framework sequence and heavy chain constant region, if present, substantially from human heavy chain variable region framework and constant region sequences. Similarly, a humanized light chain typically has all three CDRs entirely or substantially from a donor antibody light chain, and a light chain variable region framework sequence and light chain constant region, if present, substantially from human light chain variable region framework and constant region sequences.

[0084] Although humanized antibodies often incorporate all six CDRs (preferably as defined by Kabat or IMGT®) from a mouse antibody, they can also be made with fewer than all six CDRs (e.g., at least 3, 4, or 5) CDRs from a mouse antibody (e.g., Pascalis et al., J. Immunol. 169:3076, 2002; Vajdos et al., Journal of Molecular Biology, 320: 415-428, 2002; Iwahashi et al., Mol. Immunol. 36: 1079-1091, 1999; Tamura et al, Journal of Immunology, 164: 1432- 1441, 2000).

[0085] A “cytotoxic effect” refers to the depletion, elimination and / or killing of a target cell. A “cytotoxic agent” refers to a compound that has a cytotoxic effect on a cell, thereby mediating depletion, elimination and / or killing of a target cell. In certain embodiments, a cytotoxic agent is conjugated to an antibody or administered in combination with an antibody. Suitable cytotoxic agents are described further herein.

[0086] An “isolated” nucleic acid molecule is a nucleic acid molecule that is identified and separated from at least one contaminant nucleic acid molecule with which it is ordinarily associated in the natural source of the antibody nucleic acid. An isolated nucleic acid molecule is other than in the form or setting in which it is found in nature. Isolated nucleic acid molecules therefore are distinguished from the nucleic acid molecule as it exists in natural cells. However, an isolated nucleic acid molecule includes a nucleic acid molecule contained in cells that ordinarily express the antibody where, for example, the nucleic acid molecule is in a chromosomal location different from that of natural cells.

[0087] A polynucleotide is composed of a specific sequence of four nucleotide bases: adenine (A); cytosine (C); guanine (G); thymine (T); and uracil (U) for thymine when the polynucleotide is RNA. Thus, the term “polynucleotide sequence” is the alphabetical representation of a polynucleotide molecule. This alphabetical representation can be input into databases in a computer having a central processing unit and used for bioinformatics applications such as functional genomics and homology searching. The term “polymorphism” refers to the coexistence of more than one form of a gene or portion thereof. A portion of a gene of which there are at least two different forms, i.e., two different nucleotide sequences,is referred to as a “polymorphic region of a gene”. A polymorphic region can be a single nucleotide, the identity of which differs in different alleles.

[0088] The terms “polynucleotide” and “oligonucleotide” are used interchangeably and refer to a polymeric form of nucleotides of any length, either deoxyribonucleotides or ribonucleotides or analogs thereof. Polynucleotides can have any three-dimensional structure and may perform any function, known or unknown. The following are non-limiting examples of polynucleotides: a gene or gene fragment (for example, a probe, primer, EST or SAGE tag), exons, introns, messenger RNA (mRNA), transfer RNA, ribosomal RNA, ribozymes, cDNA, dsRNA, siRNA, miRNA, recombinant polynucleotides, branched polynucleotides, plasmids, vectors, isolated DNA of any sequence, isolated RNA of any sequence, nucleic acid probes and primers. A polynucleotide can comprise modified nucleotides, such as methylated nucleotides and nucleotide analogs. If present, modifications to the nucleotide structure can be imparted before or after assembly of the polynucleotide. The sequence of nucleotides can be interrupted by non-nucleotide components. A polynucleotide can be further modified after polymerization, such as by conjugation with a labeling component. The term also refers to both double- and single-stranded molecules. Unless otherwise specified or required, any embodiment of this disclosure that is a polynucleotide encompasses both the double-stranded form and each of two complementary single-stranded forms known or predicted to make up the double-stranded form.

[0089] The term “encode” as it is applied to polynucleotides refers to a polynucleotide which is said to “encode” a polypeptide if, in its native state or when manipulated by methods well known to those skilled in the art, it can be transcribed and / or translated to produce the mRNA for the polypeptide and / or a fragment thereof. The antisense strand is the complement of such a nucleic acid, and the encoding sequence can be deduced therefrom.I. Antibody Drug Conjugates (ADC)

[0090] Provided herein are Antibody Drug Conjugate compounds, or pharmaceutically acceptable salts thereof, having the structure of:wherein, Ab is an antibody or an antigen-binding fragment thereof; L is a linker; D is a degrader compound; and subscript z is an integer ranging from 1 to 14, wherein L is covalently bound to Ab and D.

[0091] In some embodiments, subscript z represents the number of drug linker moi eties conjugated to an antibody of an antibody-drug conjugate. In some embodiments, subscript z is an integer ranging from 1 to 8. In some embodiments, subscript z is an integer ranging from 1 to 4. In some embodiments, subscript z is 2. In some embodiments, subscript z is 4. In some embodiments, subscript z is 8. In some embodiments, there are 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, or 14 drug linker moieties conjugated to an antibody of an antibody-drug conjugate.

[0092] In some embodiments, descriptions herein of antibody-drug conjugates or compositions thereof relate to a number of antibody-drug conjugates that substantially differ only in the number of drug linker moieties conjugated to the antibody. In those embodiments, subscript z is a number that represents the average number of drug linker moieties conjugated to the antibody. In those embodiments, subscript z is a number ranging from about 1 to about 14, from about 1 to about 8, about 1 to about 4, about 2 to about 8, about 2 to about 4, or about 4 to about 8. In some of those embodiments, subscript z is about 8. In some of those embodiments, subscript z is about 2. In some of those embodiments, subscript z is about 4. In some embodiments, subscript z represents the average drug loading of the number of antibody-drug conjugates. In some embodiments, subscript z represents the drug loading of the predominate antibody-drug conjugate in the composition comprising a number of antibody-drug conjugates.

[0093] In some embodiments, reduced interchain disulfides will be the site of conjugation of a drug linker compound to an antibody. In some embodiments, 1 to 8 drug linker compounds will be conjugated to an antibody via reduced interchain disulfides. In some embodiments, 1 to 4 drug linker compounds will be conjugated to an antibody via reduced interchain disulfides. In some embodiments, an introduced cysteine will be the site of conjugation of a drug linker compound to an antibody. In some embodiments, 1 to 8 drug linker compounds will be conjugated to an antibody via an introduced cysteine. In some embodiments, 1 to 4 drug linker compounds will be conjugated to an antibody via an introduced cysteine. In some embodiments, reduced interchain disulfides as well as one or more introduced cysteines will be the site of conjugation of drug linker compounds to an antibody. In some embodiments, 1 to 8 drug linker compounds will be conjugated to an antibody via reduced interchain disulfides as well as one or more introduced cysteines. In some embodiments, 1 to 4 drug linker compounds will be conjugated to an antibody via reduced interchain disulfides as well as one or more introduced cysteines.

[0094] In some embodiments described herein, the sulfur atom of a side chain of the cysteine of an antibody is represented as “S”. For example, a sulfur atom of the cysteine of the antibody of the Antibody Drug Conjugate compounds shown in Table 1 is denoted as “S”.Antibodies, Antigen-binding Fragments, and Antigens

[0095] A conventional antibody, also known as an immunoglobulin (Ig), is a large heterotetrameric protein which is composed of two heavy chains and two light chains. The heavy chain of a conventional IgG consists of a heavy chain variable (VH) domain and three constant domains (CHI, CH2 and CH3), wherein the CHI and CH2 are joined together by a hinge region, whereas the light chain consists of a light chain variable (VL) domain and a constant domain (CL). The fragment antigen-binding (Fab) is the antibody region that binds to antigens. The Fab is composed of one constant and one variable domain of each of the heavy and the light chain (i.e., VH-CH1 paired with VL-CL). Together, these domains shape the paratope and the antigen-binding site at the amino terminal end of the antibody Fab. The Fv region is similar to the Fab, but only contains one variable domain of each of the heavy and the light chain. The Fc (fragment, crystalizable) region is composed of two heavy chain fragments that contribute two (i.e., CH2 and CH3) or three constant domains, depending on the class of the antibody, and plays a role in modulating immune cell activity. Finally, the Fd region is the initial 220 residues of the amino terminal side of the heavy chain, which often includes the heavy chain variable (VH) domain and CHI domain. The antibodies suitable for use in the ADCs disclosed herein can be full-length antibodies or antigen-binding fragments thereof.

[0096] In some aspects, provided herein is an ADC comprising an antibody or antigenbinding fragment thereof. A number of suitable antibodies and antigen-binding fragments can be used in the compositions and methods of the present invention. Antibodies suitable for use in the present invention are useful for a number of applications, including in vitro or in vivo diagnosis, in vivo imaging, and therapy for diseases and conditions associated with various target antigens. Five human antibody classes (IgG, IgA, IgM, IgD and IgE), as well as various subclasses (e.g., IgGl, IgG2, IgG3, IgG4, IgAl and IgA2) within these classes, are recognized on the basis of structural differences, such as the number of immunoglobulin units in a single antibody molecule, the disulfide bridge structure of the individual units, and differences in chain length and sequence. The class and subclass of an antibody is referred to as the antibody's isotype.

[0097] The antibody suitable for use in the ADCs of the present disclosure can be a full- length antibody or an antigen-binding antibody fragment thereof. In some embodiments, the antibody or antigen-binding fragment contains at least one inter-chain disulfide bond. In some embodiments, the antibody is a full-length antibody. In some embodiments, the antibody is a full-length antibody selected from the group consisting of IgA, IgD, IgE, IgG, and IgM. In some embodiments, the antibody is selected from the group consisting of IgG, IgA, IgM, IgD and IgE antibody. In some embodiments, the antibody is an IgG antibody. In some embodiments, the antibody is of an isotype selected from the group consisting of IgGl, IgG2, IgG3, and IgG4 antibody. In some embodiments, the antibody is an IgA antibody. In some embodiments, the antibody is an IgAl antibody or IgA2 antibody. In some embodiments, the light chain is a human kappa light chain. In some embodiments, the light chain is a human kappa lambda chain. In some embodiments, the antibody is monoclonal. In some embodiments, the antibody is polyclonal.

[0098] The antibodies suitable for use in the ADCs of the present disclosure can be post- translationally or chemically modified in ways that alter their activity, stability, half-life, secretion, immunogenicity, and / or and function. Antibody glycosylation is a major post- translational modification that influences antibody function. Particular asparagine residues in the antibody Fc region are modified by N-glycans, but residues in the Fab region can also be glycosylated. These residues are often considered and manipulated when engineering new antibody therapeutics to help tune the host immunological response and antibody antigenicity, respectively. Antibody glycosylation may include fucosylation, galactosylation, bisection and sialylation modifications. In IgG antibodies, heavy chain residue asparagine 297 (N297) according to Kabat numbering is glycosylated. In other antibody isotypes, additional residues in the heavy chain are glycosylated, wherein IgM (5), IgD (3), IgE (7), IgAl (2) and IgA2 (5) each have the indicated number of N-linked glycosylation sites in their heavy chains, and wherein the glycans are more complex. IgD and IgAl also possess multiple O-linked glycosylation sites. In some embodiments, the antibody or antigen-binding fragment glycosylation is N-linked. In some embodiments, the antibody or antigen-binding fragment glycosylation is O-linked. In some embodiments, the antibody or antigen-binding fragment glycosylation is biantennary. In some embodiments, the antibody or antigen-binding fragment glycosylation is triantennary or tetraantennary. In some embodiments, the antibody or antigen-binding fragment thereof is fucosylated. In some embodiments, the antibody or antigen-binding fragment thereof comprises a bisecting GlcNAc moiety. In some embodiments, the antibody or antigen-binding fragment thereof is monogalactosylated ordigalactosylated. In some embodiments, the antibody or antigen-binding fragment thereof is sialyated. In some embodiments, the antibody or antigen-binding fragment thereof is modified such that sites of glycosylation within the antibody can no longer be glycosylated. In some embodiments, the antibody or antigen-binding fragment thereof comprises an amino acid substitution at the site of glycosylation. In some embodiments, the antibody or antigenbinding fragment thereof is afucosylated. In some embodiments, the antibody or antigenbinding fragment thereof is agalactosylated. In some embodiments, the antibody is asialylated.

[0099] Typically, the antibodies suitable for use in the ADCs of the present disclosure are human, rodent (e.g., mouse and rat), donkey, sheep, rabbit, goat, guinea pig, cam elid, horse, or chicken. The antibody can be, for example, a murine, a chimeric, humanized, or fully human antibody produced by techniques well-known to one of skill in the art. In some embodiments, the antibody is chimeric, human or humanized. In some embodiments, the antibody is chimeric. In some embodiments, the antibody is human. In some embodiments, the antibody is murine. In some embodiments, the antibody is humanized.

[0100] Recombinant antibodies, such as chimeric and humanized monoclonal antibodies, comprising both human and non-human portions which can be made using standard recombinant DNA techniques, may be used as the antibodies in the ADCs of the present disclosure. A chimeric antibody is a molecule in which different portions are derived from different animal species, such as those having a variable region derived from a murine monoclonal and human immunoglobulin constant regions. (See, e.g., Cabilly et al., U.S. Pat. No. 4,816,567; and Boss et al., U.S. Pat. No. 4,816,397, which are incorporated herein by reference in their entirety.) Humanized antibodies are antibody molecules from non-human species having one or more complementarity determining regions (CDRs) from the non- human species and a framework region from a human immunoglobulin molecule. (See, e.g., Queen, U.S. Pat. No. 5,585,089, which is incorporated herein by reference in its entirety.) Such chimeric and humanized monoclonal antibodies can be produced by recombinant DNA techniques known in the art. As used herein, “human” antibodies include antibodies having the amino acid sequence of a human immunoglobulin and include antibodies isolated from human immunoglobulin libraries, from human B cells, or from animals transgenic for one or more human immunoglobulin, as described for example in U.S. Pat. Nos. 5,939,598 and 6,111,166.

[0101] The antibodies may be monospecific, bispecific, trispecific, or of greater multispecificity. A wide variety of multispecific recombinant antibody formats have beendeveloped, for example, tetravalent bispecific antibodies by fusion of, e.g., an IgG antibody format and single chain domains (see e.g., Coloma, M. J., et al., Nature Biotech 15 (1997) 159-163; WO 2001 / 077342; and Morrison, S. L., Nature Biotech 25 (2007) 1233-1234). In some embodiments, the antibody or antigen-binding fragment thereof is monospecific. In some embodiments, the antibody or antigen-binding fragment thereof is bispecific. In some embodiments, the antibody or antigen-binding fragment thereof is trispecific. In some embodiments, the antibody or antigen-binding fragment thereof is multi specific. In some embodiments, the antibody or antigen-binding fragment thereof is bivalent, trivalent, tetravalent, pentavalent, or more, wherein the valency refers to the number of antibody antigen binding sites. In some embodiments, the monospecific, bispecific, trispecific or multispecific antibody or antigen-binding fragment thereof is a chimeric antibody or antigenbinding fragment thereof. In some embodiments, the monospecific, bispecific, trispecific or multispecific antibody or antigen-binding fragment thereof is a recombinant antibody or antigen-binding fragment thereof produced by techniques well-known to one of skill in the art.

[0102] Several other formats have been developed wherein the antibody core structure (IgA, IgD, IgE, IgG or IgM) is no longer retained such as diabodies, triabodies or tetrabodies, minibodies, several single chain formats (scFv, Bis-scFv), which are capable of binding two or more antigens, have been developed (Holliger, P., et al, Nature Biotech 23 (2005) 1126- 1136; Fischer, N., and Leger, O., Pathobiology 74 (2007) 3-14; Shen, J., et al., Journal of immunological Methods 318 (2007) 65-74; Wu, C., et al., Nature Biotech. 25 (2007) 1290- 1297). In some embodiments, the antibody or antigen-binding fragment thereof is a single chain fragment variable (scFv). In some embodiments, the antibody or antigen-binding fragment thereof is a bispecific (Bis)-scFv. In some embodiments, the antibody or antigenbinding fragment thereof is a diabody, triabody or tetrabody. In some embodiments, the antibody or antigen-binding fragment thereof is a diabody. In some embodiments, the antibody or antigen-binding fragment thereof is a triabody. In some embodiments, the antibody or antigen-binding fragment thereof is a tetrabody. In some embodiments, the antibody or antigen-binding fragment thereof is a minibody, wherein the minibody is bispecific and comprises two Fab regions (Fab2).

[0103] More recently, camelids and sharks were discovered to possess unconventional antibodies in their immune system, known as camelid heavy-chain antibodies (HCAbs) and immunoglobulin new antigen receptors (IgNARs) respectively, reviewed in Cheong et al., Int J Macromol, 2020; 147:369-375. IgNARs are homodimers that are naturally devoid of lightchain, where each heavy chain consists of five constant domains followed by one variable domain. VNARs contain autonomous function as single-domain antibodies, which are promising therapeutic candidates due to their small size, high specificities for a cognate antigen, and high physiochemical stability. VNARs have structural diversity in their antigen binding sites and are capable of accessing more cryptic epitopes and catalytic clefts of enzymes. In some embodiments, the antibody or antigen-binding fragment thereof is a singledomain antibody. In some embodiments, the antibody or antigen-binding fragment suitable for use in the ADCs of the present disclosure is a variable domain of an IgNAR (VNAR).

[0104] The variable domain of an IgNAR (i.e., the VNAR), contains only two complementarity-determining regions (CDRs), CDR1 and CDR3. Diversity of VNAR is achieved by long variable protruding CDR3, while the CDR1 is connected through two hypervariable regions (HV), HV2 and HV4. The structure of CDR3 combined with supporting intermolecular disulfide bridging confers the VNAR domain unique access to confined epitopes. Without a CDR2, VNARs are the smallest naturally occurring immunoglobulin-based protein scaffolds (roughly 12 kDa), providing a simple, highly stable scaffold useful in targeting new and difficult antigens. VNARs are categorized into four isotypes based on the position and the number of non-canonical cysteine residues.

[0105] Non-limiting examples of antibody-like backbones that may be used in an ADC according to the invention include monospecific and bispecific fragments such as multimerizing scFv fragments (diabodies, triabodies, tetrabodies), disulfide stabilized antibody variable (Fv) fragments, disulfide stabilized antigen-binding (Fab) fragments consisting of the VL, VH, CL and CHI domains, bivalent F(ab’)2 fragments, Fd fragments consisting of the heavy chain and CHI domains, dimeric CH2 domain fragments (CH2D), FC antigen binding domains (Fcabs), single chain FV-CH3 minibodies, bispecific minibodies, isolated complementary determining region 3 (CDR3) fragments, constrained FR3-CDR3- FR4 polypeptides, SMTP domains, variable domains of these shark antibodies (VNARs) and any genetically manipulated counterparts of the foregoing

[0106] All such antibody or antigen-binding fragment formats use linkers either to fuse the antibody core (IgA, IgD, IgE, IgG or IgM) to a further binding protein (e.g. scFv) or to fuse, for example, two Fab fragments or scFvs (Fischer, N., and Leger, O., Pathobiology 74 (2007) 3-14). The antibody or antigen-binding fragment thereof may be engineered to retain effector functions, such as, for example, complement-dependent cytotoxicity (CDC) or antibody dependent cellular cytotoxicity (ADCC), which are mediated through the receptor binding, by maintaining a high degree of similarity to naturally occurring antibodies.

[0107] In some embodiments, the antibody or antigen-binding fragment thereof is directed to a target antigen. The antibody or antigen-binding fragment thereof may be directed against any target antigen of interest, such as of medical and / or therapeutic interest. For example, the antigen can be one associated a particular medical condition, such as cancer. In the case of a tumor-associated antigen (TAA), the cancer may be of the immune system, lung, colon, rectum, breast, ovary, prostate gland, head, neck, bone, or any other anatomical location. Antigens of interest include, but are not limited to, PSMA, CD33, HER2, Trop-2, HER3, B7H3, B7H4, CEACAM5, MET, NECTIN4, CALR, or CD123.

[0108] Useful antibodies include polyclonal antibodies, which are heterogeneous populations of antibody molecules derived from the sera of immunized animals. Other useful antibodies are monoclonal antibodies, which are homogeneous populations of antibodies to a particular antigenic determinant (e.g, a cancer cell antigen, a viral antigen, a microbial antigen, a protein, a peptide, a carbohydrate, a chemical, nucleic acid, or fragments thereof). A monoclonal antibody (mAb) to an antigen-of-interest can be prepared by using any technique known in the art which provides for production of antibody molecules by continuous cell lines in culture.

[0109] Useful monoclonal antibodies include, but are not limited to, human monoclonal antibodies, humanized monoclonal antibodies, or chimeric human-mouse (or other species) monoclonal antibodies. The antibodies include full-length antibodies and antigen binding fragments thereof. Human monoclonal antibodies may be made by any of numerous techniques known in the art (e.g., Teng et al., 1983, Proc. Natl. Acad. Set. USA. 80:7308- 7312; Kozbor et al., 1983, Immunology Today 4:72-79; and Olsson et al., 1982, Meth. Enzymol. 92:3-16).

[0110] The antibody can be a functionally active fragment, derivative or analog of an antibody that immunospecifically binds to targeted cells (e.g., cancer cell antigens, viral antigens, or microbial antigens) or other antibodies bound to tumor cells or matrix. In this regard, “functionally active” means that the fragment, derivative or analog is able to immunospecifically bind to target cells. To determine which CDR sequences bind the antigen, synthetic peptides containing the CDR sequences can be used in binding assays with the antigen by any binding assay method known in the art (e.g., the BIA core assay) (See, e.g., Kabat et al., 1991, Sequences of Proteins of Immunological Interest, Fifth Edition, National Institute of Health, Bethesda, Md; Kabat E et al., 1980, J. Immunology 125(3):961- 969).

[0111] Other useful antibodies include fragments of antibodies such as, but not limited to, F(ab’)2fragments, Fab fragments, Fvs, single chain antibodies, diabodies, triabodies, tetrabodies, scFv, scFv-FV, bis-scFv, single domain antibodies or any other molecule with the same specificity as the antibody. Engineered antibodies that are multivalent and / or multispecific can also be used, for example, a tetravalent bispecific antibody or any other molecule engineered antibody described herein.

[0112] Additionally, recombinant antibodies, such as chimeric and humanized monoclonal antibodies, comprising both human and non-human portions, which can be made using standard recombinant DNA techniques, are useful antibodies. A chimeric antibody is a molecule in which different portions are derived from different animal species, such as for example, those having a variable region derived from a murine monoclonal and human immunoglobulin constant regions. (See, e.g., U.S. Patent No. 4,816,567; and U.S. Patent No. 4,816,397, which are incorporated herein by reference in their entirety). Humanized antibodies are antibody molecules from non-human species having one or more complementarity determining regions (CDRs) from the non-human species and a framework region from a human immunoglobulin molecule. (See, e.g., U.S. Patent No. 5,585,089, which is incorporated herein by reference in its entirety). Such chimeric and humanized monoclonal antibodies can be produced by recombinant DNA techniques known in the art, for example using methods, each of which is specifically incorporated herein by reference, as described in International Publication No. WO 87 / 02671; European Patent Publication No. 0 184 187; European Patent Publication No. 0 171 496; European Patent Publication No. 0 173 494; International Publication No. WO 86 / 01533; U.S. Patent No. 4,816,567; European Patent Publication No.012 023; Berter et al., Science (1988) 240: 1041-1043; Liu et al., Proc. Natl. Acad. Sci. (USA) (1987) 84: 3439-3443; Liu et al., J. Immunol. (1987) 139: 3521-3526; Sun et al. Proc. Natl. Acad. Sci. (USA) (1987) 84: 214-218; Nishimura et al. Cancer. Res. (1987) 47: 999-1005; Wood et al., Nature (1985) 314:446-449; Shaw et al., J. Natl. Cancer Inst. (1988) 80: 1553-1559; Morrison, Science (1985) 229: 1202-1207; Oi et al. BioTechniques (1986) 4: 214; U.S. Patent No. 5,225,539; Jones et al., Nature (1986) 321 : 552-525;Verhoeyan et al., Science (1988) 239: 1534; and Beidler et al., J. Immunol. (1988) 141 : 4053- 4060.

[0113] Completely human antibodies can be produced using transgenic mice or other transgenic animals that are incapable of expressing endogenous immunoglobulin heavy and light chains genes, but which can express human heavy and light chain genes.

[0114] Antibodies include analogs and derivatives that are either modified, i.e., by the covalent attachment of any type of molecule if such covalent attachment permits the antibody to retain its antigen binding immunospecificity. For example, but not by way of limitation, derivatives and analogs of the antibodies include those that have been further modified, e.g., by glycosylation, acetylation, PEGylation, phosphorylation, amidation, derivitization by known protecting / blocking groups, proteolytic cleavage, linkage to a cellular antibody unit or other protein, etc. Any of numerous chemical modifications can be carried out by known techniques including, but not limited to, specific chemical cleavage, acetylation, formylation, metabolic synthesis in the presence of tunicamycin, etc. Additionally, the analog or derivative can contain one or more unnatural amino acids.

[0115] Further, associated heterologous molecules which may be fused, linked, joined covalently or non-covalently, or otherwise engineered together in accordance with the disclosure may comprise, e.g., one or more biologically active molecules and / or imaging agents. Exemplary biologically active molecules include, e.g., toxins for targeted cell death (useful e.g., in certain hyperproliferative diseases or disorders such as cancers or aberrant proliferative conditions). Other exemplary biologically active molecules which may be used in association with the antibody or antigen-binding fragment thereof of the ADCs of the disclosure include, e.g., polypeptides, such as an antibody or antibody fragment; a therapeutic peptide such as a hormone, cytokine, growth factor, enzyme, antigen or antigenic peptide, transcription factor, or any functional domain thereof. Other exemplary biologically active molecules which may be used in association with the antibody or antigen-binding fragment thereof suitable for use in the ADCs of the disclosure include, e.g., nucleic acid molecules, such as an oligonucleotide (e.g., single, double or more stranded RNA and / or DNA molecules, and analogs and derivatives thereof); small regulatory RNA such as shRNA, miRNA, siRNA and the like; and a plasmid or fragment thereof.

[0116] Antibodies can have modifications (e.g., substitutions, deletions or additions) in amino acid residues that interact with Fc receptors. In particular, antibodies can have modifications in amino acid residues identified as involved in the interaction between the anti-Fc domain and the FcRn receptor (see, e.g., International Publication No. WO 97 / 34631, which is incorporated herein by reference in its entirety).

[0117] In specific embodiments, known antibodies for the treatment of cancer are used. In some embodiments, the antibody will selectively bind to a cancer antigen of a hematological malignancy.

[0118] In some embodiments, the antibody or antigen-binding fragment thereof is a full- length antibody, a Fab, a Fab’, a (Fab’)2, an Fv, or a single chain Fv (scFv). In some embodiments, the antibody or antigen-binding fragment thereof is a half antibody. In some embodiments, the antibody is a full-length antibody. In some embodiments, the antibody is an asymmetric antibody. In some embodiments, the antibody comprises at least one heavy chain variable domain (VH) and at least one light chain variable domain (VL). In some embodiments, the heavy chain variable domain comprises three heavy chain complementarity determining regions (CDR-H1-3). In some embodiments, the light chain variable domain comprises three light chain complementarity determining regions (CDR-L1-3).

[0119] Exemplary antigens for the antibodies are provided below. Exemplary antibodies that bind the indicated antigen are shown in parentheses.

[0120] In some embodiments, the antigen (e.g., the antigen for the antibody) is a tumor- associated antigen. In some embodiments, the tumor-associated antigen is a transmembrane protein. For example, the following antigens are transmembrane proteins: ANTXR1, BAFF- R, CA9 (exemplary antibodies include girentuximab), CD147 (exemplary antibodies include gavilimomab and metuzumab), CD 19, CD20 (exemplary antibodies include divozilimab and ibritumomab), CD274 also known as PD-L1 (exemplary antibodies include adebrelimab, atezolizumab, garivulimab, durvalumab, and avelumab), CD30 (exemplary antibodies include iratumumab and brentuximab), CD33 (exemplary antibodies include lintuzumab, gemtuzumab, and vadastuximab), CD352, CD45 (exemplary antibodies include apamistamab), CD47 (exemplary antibodies include letaplimab and magrolimab), CLPTM1L, CD205 also known as LY75 and CLEC13B, DPP4, EGFR, ERVMER34-1, FASL, FSHR, FZD5, FZD8, GUCY2C (exemplary antibodies include indusatumab), IFNA1 (exemplary antibodies include faralimomab), IFNAR1, IFNAR2, LMP2, MLANA, SIT1, TLR2 / 4 / 1 (exemplary antibodies include tomaralimab), TM4SF5, TMEM132A, TMEM40, UPK1B, VGFR1, VGRF2, and VEGFR2 (exemplary antibodies include gentuximab).

[0121] In some embodiments, the tumor-associated antigen is a growth factor protein. For example, the following antigen is a growth factor protein: VEGF (exemplary antibodies include bevacizumab).

[0122] In some embodiments, the tumor-associated antigen is a transmembrane transport protein. For example, the following antigens are transmembrane transport proteins: ASCT2 (exemplary antibodies include idactamab), MFSD13A, Mincle, N0X1, SLC10A2, SLC12A2, SLC17A2, SLC38A1, SLC34A2, SLC39A5, SLC39A6 also known as LIV1 (exemplary antibodies include ladiratuzumab), SLC44A4, SLC6A15, SLC6A6, SLC7A11, and SLC7A5.

[0123] In some embodiments, the tumor-associated antigen is a transmembrane or membrane-associated glycoprotein. For example, the following antigens are transmembrane or membrane-associated glycoproteins: CA-125, CA19-9, CAMPATH-1 (exemplary antibodies include alemtuzumab), carcinoembryonic antigen (exemplary antibodies include arcitumomab, cergutuzumab, amunaleukin, and labetuzumab), CD112, CD155, CD24, CD247, CD37 (exemplary antibodies include lilotomab), CD38 (exemplary antibodies include felzartamab and daratumumab), CD3D, CD3E (exemplary antibodies include foralumab and teplizumab), CD3G, CD96, CDCP1, CDH17, CDH3, CDH6, CEACAM1, CEACAM6, CLDN1, CLDN6, CLDN16, CLDN18.1 (exemplary antibodies include zolbetuximab), CLDN18.2 (exemplary antibodies include zolbetuximab), CLDN19, CLDN2, DPEP1, DPEP3, DSG2, endosialin (exemplary antibodies include ontuxizumab), ENPP1, EPCAM (exemplary antibodies include adecatumumab), FN, FN1, Gp10O, Globo H, GPA33, gpNMB (exemplary antibodies include glembatumumab), ICAM1, LI CAM, LAMP1, MELTF also known as CD228, NCAM1, Nectin-4 (exemplary antibodies include enfortumab), PDPN, PROMI, PSCA, PSMA (exemplary antibodies include J591 / MLN591 and rosopatamab), Siglecs 1-16, SIRPa, SIRPg, TACSTD2 also know as TROP2 (exemplary antibodies include sacituzumab and datoptamab), TAG-72, Tenascin, Tissue Factor also known as TF (exemplary antibodies include tisotumab), ULBP1 / 2 / 3 / 4 / 5 / 6, and 5T4.

[0124] In some embodiments, the tumor-associated antigen is a transmembrane or membrane-associated receptor kinase. For example, the following antigens are transmembrane or membrane-associated receptor kinases: ALK, AXL (exemplary antibodies include tilvestamab and enapotamab), BMPR2, DCLK1, DDR1, EPHA receptors, EPHA2, ERBB2 also known as HER2 (exemplary antibodies include trastuzumab, pertuzumab, margetuximab, and disitamab), ERBB3, FLT3, MET (exemplary antibodies include telisotuzumab), IGF1R, PDGFR-B (exemplary antibodies include rinucumab), PTK7 (exemplary antibodies include cofetuzumab), RET, ROR1 (exemplary antibodies include cirmtuzumab), ROR2, ROS1, and Tie3.

[0125] In some embodiments, the tumor-associated antigen is a membrane-associated or membrane-localized protein. For example, the following antigens are membrane-associated or membrane-localized proteins: ALPP, ALPPL2, ANXA1, FOLR1 (exemplary antibodies include farletuzumab and mirvetuximab), IL13Ra2, IL1RAP (exemplary antibodies include nidanilimab), NT5E, 0X40, Ras mutant, RGS5, RhoC, SLAMF7 (exemplary antibodies include elotuzumab), and VSIR.

[0126] In some embodiments, the tumor-associated antigen is a transmembrane G-protein coupled receptor (GPCR). For example, the following antigens are GPCRs: CALCR, CD97, GPR87, and KISS1R.

[0127] In some embodiments, the tumor-associated antigen is cell-surface-associated or a cell-surface receptor. For example, the following antigens are cell-surface-associated and / or cell-surface receptors: B7-DC, BCMA, CD137, CD 244, CD3 (exemplary antibodies include otelixizumab and visilizumab), CD48, CD5 (exemplary antibodies include zolimomab aritox), CD70 (exemplary antibodies include cusatuzumab and vorsetuzumab), CD74 (exemplary antibodies include milatuzumab), CD79A, CD-262 (exemplary antibodies include tigatuzumab), DR4 (exemplary antibodies include mapatumumab), FAS, FGFR1, FGFR2 (exemplary antibodies include aprutumab), FGFR3 (exemplary antibodies include vofatamab), FGFR4, GITR (exemplary antibodies include ragifilimab), Gpc3, GITR (exemplary antibodies include ragifilimab), HAVCR2, HLA-E, HLA-F, HLA-G, LAG-3 (exemplary antibodies include encelimab), LY6G6D, LY9, MICA, MICB, MSLN, MUCl, MUC5AC, NY-ESO-1, OY-TES1, PLEC, PVRIG, Sialyl-Thomsen-Nouveau Antigen, Sperm protein 17, TNFRSF12, and uPAR.

[0128] In some embodiments, the tumor-associated antigen is a chemokine receptor or cytokine receptor. For example, the following antigens are chemokine receptors or cytokine receptors: CD115 (exemplary antibodies include axatilimab, cabiralizumab, and emactuzumab), CD123, CXCR 4 (exemplary antibodies include ulocuplumab), IL-21R, and IL-5R (exemplary antibodies include benralizumab).

[0129] In some embodiments, the tumor-associated antigen is a co-stimulatory, surface- expressed protein. For example, the following antigens are co-stimulatory, surface-expressed proteins: B7-H3 (exemplary antibodies include enoblituzumab and omburtamab), B7-H4, B7- H6, and B7-H7.

[0130] In some embodiments, the tumor-associated antigen is a transcription factor or a DNA-binding protein. For example, the following antigens are transcription factors: ETV6- AML, MYCN, PAX3, PAX5, and WT1. The following protein is a DNA-binding protein: BORIS.

[0131] In some embodiments, the tumor-associated antigen is an integral membrane protein. For example, the following antigens are integral membrane proteins: SLITRK6 (exemplary antibodies include sirtratumab), UPK2, and UPK3B.

[0132] In some embodiments, the tumor-associated antigen is an integrin. For example, the following antigens are integrin antigens: alpha v beta 6, ITGAV (exemplary antibodies include abituzumab), ITGB6, and ITGB8.

[0133] In some embodiments, the tumor-associated antigen is a glycolipid. For example, the following are glycolipid antigens: FucGMl, GD2 (exemplary antibodies include dinutuximab), GD3 (exemplary antibodies include mitumomab), GloboH, GM2, and GM3 (exemplary antibodies include racotumomab).

[0134] In some embodiments, the tumor-associated antigen is a cell-surface hormone receptor. For example, the following antigens are cell-surface hormone receptors: AMHR2 and androgen receptor.

[0135] In some embodiments, the tumor-associated antigen is a transmembrane or membrane-associated protease. For example, the following antigens are transmembrane or membrane-associated proteases: ADAM12, ADAM9, TMPRSS11D, and metalloproteinase.

[0136] In some embodiments, the tumor-associated antigen is aberrantly expressed in individuals with cancer. For example, the following antigens may be aberrantly expressed in individuals with cancer: AFP, AGR2, AKAP-4, ARTN, BCR-ABL, C5 complement, CCNB1, CSPG4, CYP1B1, De2-7 EGFR, EGF, Fas-related antigen 1, FBP, G250, GAGE, HAS3, HPV E6 E7, hTERT, IDO1, LCK, Legumain, LYPD1, MAD-CT-1, MAD-CT-2, MAGEA3, MAGEA4, MAGEC2, MerTk, ML-IAP, NA17, NY-BR-1, p53, p53 mutant, PAP, PLAVI, polysialic acid, PR1, PSA, Sarcoma translocation breakpoints, SART3, sLe, SSX2, Survivin, Tn, TRAIL, TRAIL 1, TRP-2, and XAGE1.

[0137] In some embodiments, the antigen is an immune-cell-associated antigen. In some embodiments, the immune-cell-associated antigen is a transmembrane protein. For example, the following antigens are transmembrane proteins: BAFF-R, CD 163, CD 19, CD20 (exemplary antibodies include rituximab, ocrelizumab, divozilimab; ibritumomab), CD22, CD25 (exemplary antibodies include basiliximab), CD274 also known as PD-L1 (exemplary antibodies include adebrelimab, atezolizumab, garivulimab, durvalumab, and avelumab), CD30 (exemplary antibodies include iratumumab and brentuximab), CD33 (exemplary antibodies include lintuzumab), CD352, CD45 (exemplary antibodies include apamistamab), CD46, CD47 (exemplary antibodies include letaplimab and magrolimab), CTLA4 (exemplary antibodies include ipilimumab), FASL, IFNAR1 (exemplary antibodies include faralimomab), IFNAR2, LAYN, LILRB2, LILRB4, PD-1 (exemplary antibodies include ipilimumab, nivolumab, pembrolizumab, balstilimab, budigalimab, geptanolimab,toripalimab, and pidilizumabsf), SIT1, and TLR2 / 4 / 1 (exemplary antibodies include tomaralimab).

[0138] In some embodiments, the immune-cell-associated antigen is a transmembrane transport protein. For example, Mincle is a transmembrane transport protein.

[0139] In some embodiments, the immune-cell-associated antigen is a transmembrane or membrane-associated glycoprotein. For example, the following antigens are transmembrane or membrane-associated glycoproteins: CD112, CD155, CD24, CD247, CD28, CD30L, CD37 (exemplary antibodies include lilotomab), CD38 (exemplary antibodies include felzartamab and daratumumab), CD3D, CD3E (exemplary antibodies include foralumab and teplizumab), CD3G, CD44, CLEC12A (exemplary antibodies include tepoditamab), DCIR, DCSIGN, Dectin 1, Dectin 2, ICAM1, LAMP1, Siglecs 1-16, SIRPa, SIRPg, and ULBP1 / 2 / 3 / 4 / 5 / 6.

[0140] In some embodiments, the immune-cell-associated antigen is a transmembrane or membrane-associated receptor kinase. For example, the following antigens are transmembrane or membrane-associated receptor kinases: AXL (exemplary antibodies include tilvestamab and enapotamab) and FLT3.

[0141] In some embodiments, the immune-cell-associated antigen is a membrane-associated or membrane-localized protein. For example, the following antigens are membrane- associated or membrane-localized proteins: CD83, IL1RAP (exemplary antibodies include nidanilimab), 0X40, SLAMF7 (exemplary antibodies include elotuzumab), and VSIR.

[0142] In some embodiments, the immune-cell-associated antigen is a transmembrane G- protein coupled receptor (GPCR). For example, the following antigens are GPCRs: CCR4 (exemplary antibodies include mogamulizumab-kpkc), CCR7, CCR8, and CD97.

[0143] In some embodiments, the immune-cell-associated antigen is cell-surface-associated or a cell-surface receptor. For example, the following antigens are cell-surface-associated and / or cell-surface receptors: B7-DC, BCMA, CD137, CD2 (exemplary antibodies include siplizumab), CD244, CD27 (exemplary antibodies include varlilumab), CD278 (exemplary antibodies include feladilimab and vopratelimab), CD3 (exemplary antibodies include otelixizumab and visilizumab), CD40 (exemplary antibodies include dacetuzumab and lucatumumab), CD48, CD5 (exemplary antibodies include zolimomab aritox), CD70 (exemplary antibodies include cusatuzumab and vorsetuzumab), CD71, CD74 (exemplary antibodies include milatuzumab), CD79A, CD262 (exemplary antibodies include tigatuzumab), DR4 (exemplary antibodies include mapatumumab), GITR (exemplary antibodies include ragifilimab), HAVCR2, HLA-DR, HLA-E, HLA-F, HLA-G, LAG-3(exemplary antibodies include encelimab), MICA, MICB, MRC1, PVRIG, Sialyl -Thomsen- Nouveau Antigen, TIGIT (exemplary antibodies include etigilimab), Trem2, and uPAR.

[0144] In some embodiments, the immune-cell-associated antigen is a chemokine receptor or cytokine receptor. For example, the following antigens are chemokine receptors or cytokine receptors: CD115 (exemplary antibodies include axatilimab, cabiralizumab, and emactuzumab), CD123, CXCR4 (exemplary antibodies include ulocuplumab), IL-21R, and IL-5R (exemplary antibodies include benralizumab).

[0145] In some embodiments, the immune-cell-associated antigen is a co-stimulatory, surface-expressed protein. For example, the following antigens are co-stimulatory, surface- expressed proteins: B7-H 3 (exemplary antibodies include enoblituzumab and omburtamab), B7-H4, B7-H6, and B7-H7.

[0146] In some embodiments, the immune-cell-associated antigen is a peripheral membrane protein. For example, the following antigens are peripheral membrane proteins: B7-1 (exemplary antibodies include galiximab) and B7-2.

[0147] In some embodiments, the immune-cell-associated antigen is aberrantly expressed in individuals with cancer. For example, the following antigens may be aberrantly expressed in individuals with cancer: C5 complement, IDO1, LCK, MerTk, and Tyrol.

[0148] In some embodiments, the antigen is a stromal-cell-associated antigen. In some embodiments, the stromal-cell-associated antigens is a transmembrane or membrane- associated protein. For example, the following antigens are transmembrane or membrane- associated proteins: FAP (exemplary antibodies include sibrotuzumab), IFNAR1 (exemplary antibodies include faralimomab), and IFNAR2.Linkers (L)

[0149] In some embodiments, a “linker” (L) is a chemical moiety that covalently links an antibody, or an antigen-binding fragment thereof, to a degrader compound to form an Antibody Drug Conjugate compound as described herein. For example, in some embodiments, a cysteine thiol of an antibody, or an antigen-binding fragment thereof, can form a covalent bond with a reactive group of a linker moiety.

[0150] In some embodiments, a “linker” (L) is a chemical moiety that is covalently bonded to a degrader compound to form a Degrader-Linker compound as described herein.

[0151] In some embodiments, the linker comprises one or more cleavable moieties. In some embodiments, the cleavable moiety is susceptible to cleavage under certain conditions.Cleavage of the cleavable moiety of an Antibody Drug Conjugate compound as described herein results in the release of the degrader compound as a free drug.

[0152] In some embodiments, the cleavable moiety comprises a peptide group. In some embodiments, the peptide group is susceptible to cleavage by an intracellular or regulatory protease but remains stable in plasma. In some embodiments, the peptide moiety comprises one or more amino acids. In some embodiments, the peptide moiety is a dipeptide. In some embodiments, the peptide moiety is a tripeptide. In some embodiments, the peptide moiety is a tetrapeptide.

[0153] In some embodiments, the cleavable moiety comprises a disulfide group. In some embodiments, the disulfide group is susceptible to cleavage in a reducing environment, such as the cytoplasm of a cell but remains stable in plasma. In some embodiments, the disulfide group is cleaved by the reducing environment caused by the concentration of intracellular glutathione.

[0154] In some embodiments, the cleavable moiety comprises an acid-labile group. In some embodiments, the acid-labile group is susceptible to hydrolysis in mildly acidic environments, such as weakly acidic endosomes (e.g., pH 5.0-6.5) or lysosomes (pH 4.5-5.0), but remains stable in neutral environments, such as blood (pH 7.3-7.5). In some embodiments, the acid-labile group is a hydrazine. In some embodiments, the acid-labile group is carbonate. In some embodiments, the acid-labile group is acetal. In some embodiments, the acid-labile group is ketal.

[0155] In some embodiments, L is a linker of Formula (II):wherein,M is selected from the group consisting of:whereinRb1and Rb2are each independently hydrogen or C1-C6alkyl, or Rb1and Rb2together with the carbon to which they are attached form a C4-C6cycloalkyl or a C4- C6heterocycloalkyl;Rb3and Rb4are each independently hydrogen or C1-C6alkyl, subscript si is 0 or 1, wherein the dashed line indicates the point of covalent attachment to the Ab and the wavy line indicates the point of covalent attachment to the remainder of the structure of L;U is absent or is -(CH2)b(Rv1)ss(C=O)u(NH)v- wherein subscript b is 0, 1, 2, 3, 4, or 5; subscript ss is 0 or 1; subscript u is 0 or 1; subscript v is 0 or 1;Rv1is -C3-C6cycloalkyl- or -C3-C6cycloalkyl-C(O)NHCH2-Rv2-, wherein Rv2is C3-C6cycloalkyl, C3-C6heterocycle, or C3-C6heteroaryl; or-(CH2CH2O)wCH2CH2(NH)-, wherein subscript w is an integer ranging from1 to 16;X is absent or is-(CH2CH2O)wCH2CH2-(C=O)d- wherein subscript w is an integer ranging from 0 to 16 and subscript d is 0 or 1;-CH(Rx1)(CH2)nnC(O)-, wherein Rx1is hydrogen, -COOH, -C(O)NHCH3, or-(C(O)NHCH2)x(CH2OCH2)yRx2, wherein Rx2is -CH2NHC(O)CH3, -CH2NH2, or - CH2C(O)ORx2a, wherein Rx2ais hydrogen or C1-C6alkyl; subscript nn is an integer ranging from 1 to 6; subscript x and subscript y are each independently an integer ranging from 0 to 8;-C(O)-C(Rx3)(Rx4)-C(O)-, wherein Rx3and Rx4are independently hydrogen or C1-C6alkyl or Rx3and Rx4together with the carbon to which they are attached form a C3-C6cycloalkyl;-heterocycloalkyl-O(CH2)iC(O)-, wherein subscript i is an integer ranging from 0 to 6;-C(O)-C(Rx5)(Rx6)-OC(O)-, wherein Rx5is hydrogen or C1-C6alkyl and Rx6is hydrogen, C1-C6alkyl,wherein subscript f is an integer ranging from 0 to 4, and each Rx7is independently hydrogen, -COOH, -NH2, C1-C6alkyl, or an independently selected side chain of an amino acid; or-(CH2CH2O)yyCH2CH2NHC(O)CH2OCH2C(O) -, wherein subscript yy is an integer ranging from 0 to 16;A A is absent or has the structure of:wherein subscript c is an integer ranging from 1 to 12; each Ra1is independently -COOH, -NH2, or an independently selected side chain of an amino acid;J is absent, -(Rj3)N(C(Rj1)(Rj2))m1-, or has the structure of:whereinRj3is hydrogen, C1-C6alkyl, or C3-C6cycloalkyl; each Rj1and Rj2is independently hydrogen, C1-C6alkyl, C3-C6cycloalkyl, - OH, or -NRj4Rj5, wherein Rj4and Rj5are each -OH or C1-C6alkyl; subscript ml is an integer ranging from 1 to 6; each Rjis independently halogen, C1-C6alkyl, or -C(O)NH(C1-C6alkyl); subscript k is an integer ranging from 0 to 4; G is absent,wherein the wavy line to M of Formula (II) indicates the point of covalent attachment to Ab and the wavy line to G of Formula (II) indicates the point of covalent attachment to D.

[0156] In some embodiments, M has the structure ofIn some embodiments, M comprises a succinimide ring. In some embodiments, a carbonyl -nitrogen bond of the succinimide ring is hydrolyzed. In some embodiments, M exists in a hydrolyzed form. In some embodiments, M comprises a succinic acid. In some embodiments, M has the structure ofIn some embodiments, M has the structure ofstructure ofIn some embodiments, the amide nitrogen corresponds to the imide nitrogen of the succinimide. It will be understood that where an ADC has a succinimide group connected to an antibody, the succinimide group may also exist in a ring- opened form.

[0157] In some embodiments, M has the structure of:whereinRb1and Rb2are each independently hydrogen or C1-C6alkyl, or Rb1and Rb2together with the carbon to which they are attached form a C4-C6cycloalkyl or a C4- C6heterocycloalkyl;Rb3and Rb4are each independently hydrogen or C1-C6alkyl, subscript si is 0 or 1, wherein the dashed line indicates the point of covalent attachment to the Ab and the wavy line indicates the point of covalent attachment to the remainder of the structure of L.

[0158] In some embodiments, M has the structure of:

[0159] In some embodiments, M has the structure of:

[0160] In some embodiments, M has the structure of:

[0161] In some embodiments, U is absent or is -(CH2)b(Rv1)ss(C=O)u(NH)v-, wherein subscript b is 0, 1, 2, 3, 4, or 5; subscript ss is 0 or 1; subscript u is 0 or 1; subscript v is 0 or1; and Rv1is -C3-C6cycloalkyl- or -C3-C6cycloalkyl-C(O)NHCH2-Rv2-, wherein Rv2is C3-C6cycloalkyl, C3-C6heterocycle, or C3-C6heteroaryl. In some embodiments, U is absent.

[0162] In some embodiments, U is present is and is -(CH2)b(Rv1)ss(C=O)u(NH)v-, wherein subscript b is 1, 2, 3, 4, or 5; subscript ss is 0; subscript u is 0 or 1; subscript v is 0 or 1. In some embodiments, U has the structure of:wherein subscript b is 1, 2, 3, 4, or 5, the dashed line indicates the point of covalent attachment to M, and the wavy line indicates the point of covalent attachment to the remaining structure of L.

[0163] In some embodiments, U has the structure of:

[0164] In some embodiments, U has the structure of:

[0165] In some embodiments, U is present and is -(CH2)b(Rv1)ss(C=O)u(NH)v-, wherein subscript b is 0, 1, 2, 3, 4, or 5; subscript ss is 1; subscript u is 0 or 1; subscript v is 0 or 1; and Rv1is -C3-C6cycloalkyl- or -C3-C6cycloalkyl-C(O)NHCH2-Rv2-, wherein Rv2is C3- C6cycloalkyl, C3-C6heterocycle, or C3-C6heteroaryl.

[0166] In some embodiments, U has the structure of:

[0167] In some embodiments, U is present and is -(CH2)b(Rv1)ss(C=O)u(NH)v-, wherein subscript b is 0, 1, 2, 3, 4, or 5; subscript ss is 1; subscript u is 0 or 1; subscript v is 0 or 1; and Rv1is -C3-C6cycloalkyl-C(O)NHCH2-Rv2-, wherein Rv2is C3-C6cycloalkyl, C3-C6heterocycle, or C3-C6heteroaryl. In some embodiments, U has the structure of:

[0168] In some embodiments, U is present and is -(CH2CH2O)wCH2CH2(NH)-, wherein subscript w is an integer ranging from 1 to 16. In some embodiments, subscript w is an integer ranging from 1 to 12. In some embodiments, subscript w is an integer ranging from 2 to 10. In some embodiments, subscript w is an integer ranging from 4 to 8. In some embodiments, subscript w is 1. In some embodiments, subscript w is 2. In some embodiments, subscript w is 4. In some embodiments, subscript w is 8.

[0169] In some embodiments, U has the structure of:

[0170] In some embodiments, X is absent.

[0171] In some embodiments, X is present and is -(CH2CH2O)wCH2CH2-(C=O)d-, wherein subscript w is an integer ranging from 0 to 16 and subscript d is 0 or 1. In some embodiments, subscript w is an integer ranging from 1 to 12. In some embodiments, subscript w is an integer ranging from 2 to 10. In some embodiments, subscript w is an integer ranging from 4 to 8. In some embodiments, subscript w is 1. In some embodiments, subscript w is 2. In some embodiments, subscript w is 4. In some embodiments, subscript w is 8. In some embodiments, d is 0. In some embodiments, d is 1.

[0172] In some embodiments, X has the structure of:

[0173] In some embodiments, X is present and is -CH(Rx1)(CH2)nnC(O)-, wherein Rx1is hydrogen, -COOH, -C(O)NHCH3, or -(C(O)NHCH2)x(CH2OCH2)yRx2, wherein Rx2is - CH2NHC(O)CH3, - CH2NH2, or - CH2C(O)ORx2a, wherein Rx2ais hydrogen or C1-C6alkyl; subscript nn is an integer ranging from 1 to 6; and subscript x and subscript y are each independently an integer ranging from 0 to 8. In some embodiments, subscript nn is aninteger ranging from 2 to 4. In some embodiments, subscript nn is 2. In some embodiments, subscript x is 5. In some embodiments, subscript x is 1. In some embodiments, subscript y is 8. In some embodiments, subscript y is 1.

[0174] In some embodiments, Rx1has the structure of:

[0175] In some embodiments, Rx1has the structure of:

[0176] In some embodiments, X has the structure of:

[0177] In some embodiments, X is present and is -C(O)-C(Rx3)(Rx4)-C(O)-, wherein Rx3and Rx4are independently hydrogen or C1-C6alkyl or Rx3and Rx4together with the carbon to which they are attached form a C3-C6cycloalkyl.

[0178] In some embodiments, X has the structure of:

[0179] In some embodiments, X has the structure of:

[0180] In certain embodiments, X has the structure of:

[0181] In some embodiments, X is present and is -heterocycloalkyl-O(CH2)iC(O)-, wherein subscript i is an integer ranging from 0 to 6. In some embodiments, subscript i is 1. In some embodiments, X has the structure of:

[0182] In some embodiments, X is present and is -C(O)-C(Rx5)(Rx6)-OC(O)-, wherein Rx5is hydrogen or C1-C6alkyl and Rx6is hydrogen, C1-C6alkyl, orwherein subscript f is an integer ranging from 0 to 4, and each Rx7is independently hydrogen, C1-C6alkyl, -COOH, -NH2, or an independently selected side chain of an amino acid. In some embodiments, the amino acid is selected from the group consisting of alanine, valine, glutamic acid, citrulline, tryptophan, glycine, phenylalanine, and lysine.

[0183] In some embodiments, Rx6has the structure of:

[0184] In some embodiments, X is -(CH2CH2O)yyCH2CH2NHC(O)CH2OCH2C(O)-, wherein subscript yy is an integer ranging from 0 to 16. In some embodiments, yy is an integer ranging from 1 to 12. In some embodiments, yy is an integer ranging from 2 to 10. In some embodiments, yy is an integer ranging from 4 to 8. In some embodiments, yy is 8.

[0185] In some embodiments, X has the structure of:wherein yy is 8.

[0186] In some embodiments, AA is absent or has the structure of:, wherein subscript c is an integer ranging from 1 to 12; each Ra1is independently -COOH, -NH2, or an independently selected side chain of an amino acid. In some embodiments, each Ra1is independently -COOH, -NH2, or an independently selected side chain of an amino acid, wherein each amino acid is selected from the group consisting of alanine, valine, glutamic acid, citrulline, tryptophan, glycine, phenylalanine, and lysine.

[0187] In some embodiments, AA is present and subscript c in an integer ranging from 1 to 10. In some embodiments, subscript c is an integer ranging from 1 to 8. In some embodiments, subscript c is an integer ranging from 1 to 6. In some embodiments, subscript c is an integer ranging from 1 to 4. In some embodiments, subscript c is 1, 2, 3, 4, or 5. In some embodiments, subscript c is 1. In some embodiments, subscript c is 2. In some embodiments, subscript c is 3. In some embodiments, subscript c is 4.

[0188] In some embodiments, c is 1 and Ra1is -COOH, -NH2, or an independently selected side chain of an amino acid selected from the group consisting of alanine, valine, glutamic acid, citrulline, tryptophan, glycine, phenylalanine, and lysine. In some embodiments, c is 1 and Ra1is citrulline.

[0189] In some embodiments, c is 2 and each Ra1is -COOH, -NH2, or an independently selected side chain of an amino acid, wherein each amino acid is selected from the group consisting of alanine, valine, glutamic acid, citrulline, tryptophan, glycine, phenylalanine, and lysine. In some embodiments, c is 2 and Ra1is valine and alanine. In some embodiments, c is 2 and Ra1is valine and glycine. In some embodiments, c is 2 and Ra1is valine and citrulline. In some embodiments, c is 2 and Ra1is tryptophan and citrulline. In some embodiments, c is 2 and Ra1is phenylalanine and citrulline.

[0190] In some embodiments, c is 3 and each Ra1is -COOH, -NH2, or an independently selected side chain of an amino acid, wherein each amino acid is selected from the group consisting of alanine, valine, glutamic acid, citrulline, tryptophan, glycine, phenylalanine, and lysine. In some embodiments, c is 3 and Ra1is glutamic acid, glycine, and citrulline.

[0191] In some embodiments, c is 4 and each Ra1is -COOH, -NH2, or an independently selected side chain of an amino acid, wherein each amino acid is selected from the group consisting of alanine, valine, glutamic acid, citrulline, tryptophan, glycine, phenylalanine, and lysine. In some embodiments, c is 4 and Ra1is glycine, glycine, phenylalanine, and glycine.

[0192] In some embodiments, AA has the structure of:

[0193] In some embodiments, J is absent, -(Rj3)N(C(Rj1)(Rj2))m1-, or has the structure of:wherein Rj3is hydrogen, C1-C6alkyl, or C3-C6cycloalkyl; each Rj1and Rj2is independently hydrogen, C1-C6alkyl, C3-C6cycloalkyl, -OH, or -NRj4Rj5, wherein Rj4and Rj5are each -OH or C1-C6alkyl; subscript ml is an integer ranging from 1 to 6; each Rjis independently halogen, C1-C6alkyl, or -C(O)NH(C1-C6alkyl); and subscript k is an integer ranging from 0 to 4.

[0194] In some embodiments, Rjis halogen. In some embodiments, Rjis fluorine. In some embodiments, Rjis chlorine. In some embodiments, Rjis fluorine. In some embodiments, Rjis C1-C6alkyl. In some embodiments, Rjis methyl. In some embodiments, Rjis -C(O)NH(Cf1-C6alkyl). In some embodiments, Rjis -C(O)NHCH3. In some embodiments, Rjis methyl, -F, -Cl, or -C(O)NHCH3.

[0195] In some embodiments, J has the structure of:

[0196] In some embodiments, G is absent,In some embodiments, G isIn some embodiments, G is absent. In some embodiments, G isIn some embodiments, G isIn some embodiments, G is

[0197] In some embodiments, the wavy line to M of Formula (II) indicates the point of covalent attachment to Ab and the wavy line to G of Formula (II) indicates the point of covalent attachment to D. In some embodiments, the wavy line to G of Formula (II) indicates the point of covalent attachment to a secondary alcohol group or a secondary amine group of D. In some embodiments, the secondary alcohol group is the alcohol group of a phenol group of D. In some embodiments, the secondary amine group is the imido nitrogen of a glutarimide group of D. In some embodiments, the secondary amine group is the amine nitrogen of a piperazine group of D.

[0198] In some embodiments, L is a linker of Formula (Ila):whereinM is selected from the group consisting of:whereinRb1and Rb2are each independently hydrogen or C1-C6alkyl, or Rb1and Rb2together with the carbon to which they are attached form a C4-C6cycloalkyl or a C4-C6heterocycloalkyl;Rb3and Rb4are each independently hydrogen or C1-C6alkyl, subscript si is 0 or 1, wherein the dashed line indicates the point of covalent attachment to the Ab and the wavy line indicates the point of covalent attachment to the remainder of the structure of L;U is absent or is -(CH2)b(Rv1)ss(C=O)u(NH)v-, wherein subscript b is 0, 1, 2, 3, 4, or 5; subscript ss is 0 or 1; subscript u is 0 or 1; subscript v is 0 or 1;Rv1is -C3-C6cycloalkyl- or -C3-C6cycloalkyl-C(O)NHCH2-Rv2-, whereinRv2is C3-C6cycloalkyl, C3-C6heterocycle, or C3-C6heteroaryl; or-(CH2CH2O)wCH2CH2(NH)-, wherein subscript w is an integer ranging from 1 to 16;X is absent or is-(CH2CH2O)wCH2CH2-(C=O)d-, wherein subscript w is an integerranging from 0 to 16 and subscript d is 0 or 1;-CH(Rx1)(CH2)nnC(O)-, wherein Rx1is hydrogen, -COOH, - C(O)NHCH3, or -(C(O)NHCH2)x(CH2OCH2)yRx2, wherein Rx2is - CH2NHC(O)CH3, - CH2NH2, or - CH2C(O)ORx2a, wherein Rx2ais hydrogen or C1-C6alkyl; subscript nn is an integer ranging from 1 to 6, and subscript x and subscript y are each independently an integer ranging from 0 to 8;-C(O)-C(Rx3)(Rx4)-C(O)-, wherein Rx3and Rx4are each independently hydrogen or C1-C6alkyl or Rx3and Rx4together with the carbon to which they are attached form a C3-C6cycloalkyl;-heterocycloalkyl-O(CH2)iC(O)-, wherein subscript I is an integer ranging from 0 to 6;-C(O)-C(Rx5)(Rx6)-OC(O)-, wherein Rx5is hydrogen or C1-C6alkyl,Rx6is hydrogen, C1-C6alkyl,, wherein subscript f is an integer ranging from 0 to 4, and each Rx7is independently hydrogen, - COOH, -NH2, C1-C6alkyl, or an independently selected side chain of an amino acid; or-(CH2CH2O)yyCH2CH2NHC(O)CH2OCH2C(O) - wherein subscript yy is an integer ranging from 0 to 16;YY is a branching unit;NN is -(CH2CH2O)k’CH2CH2C(O)-Rnn1- wherein subscript k’ is an integer ranging from 0 to 16 and Rnn1is hydrogen, C1-C6alkyl, or -OH;EE is absent or -(CH2CH2O)XCH2CH2C(O)-, wherein subscript x’ is an integer ranging from 0 to 16;A A is absent or has the structure of:wherein subscript c is an integer ranging from 1 to 12; each Ra1is independently -COOH, -NH2, or an independently selected side chain of an amino acid;J is independently absent, -(Rj3)N(C(Rj1)(Rj2))m1- or has the structure of:wherein Rj3is hydrogen, C1-C6alkyl, or C3-C6cycloalkyl; each Rj1and Rj2is independently hydrogen, C1-C6alkyl, C3-C6cycloalkyl, - OH, or -NRj4Rj5, wherein Rj4and Rj5are each -OH or C1-C6alkyl; subscript ml is an integer ranging from 1 to 6; each Rjis independently halogen, C1-C6alkyl, or -C(O)NH(C1-C6alkyl); subscript k is an integer ranging from 0 to 4;wherein the wavy line to M of Formula (Ila) indicates the point of covalent attachment to Ab and the wavy line to G of Formula (Ila) indicates the point of covalent attachment to D.

[0199] In some embodiments, YY is a branching unit selected from the group consisting of:, wherein each qq is independently -N(Ry1)- or -O-, wherein Ry1is hydrogen or C1-C6alkyl, wherein one dashed line indicates the point of covalent attachment to EE when EE is present, or to AA when EE is absent, or to J when AA and EE are absent, or to G when AA, EE, and J are absent, and the other dashed line indicatesthe point of covalent attachment to NN, wherein the wavy line indicates the point of covalent attachment to X, when X is present, or to U, when X is absent, or to M, when X and U are absent.

[0200] In some embodiments, the branching unit (YY) is an at least tri -substituted carbocycle, an at least tri -substituted heterocycle, a tertiary carbon atom, or a tertiary nitrogen atom. In some embodiments, the branching unit comprises at least three functional groups independently selected from the group consisting of an amine, a carboxylate, a thiocarboxylate, hydroxyl, thiol, carbamate, thiocarbamate, sulfonate, sulfonamide, phosphonate, and phosphinate.

[0201] In some embodiments, YY is a branching unit selected from the group consisting of:,wherein each qq is independently -N(Ry1)- or -O-, wherein Ry1is hydrogen or C1-C6alkyl. In some embodiments, the branching unit (YY) isIn some embodiments, the branching unit (YY) isand each Ry1is independently hydrogen or C1-C6alkyl. In some embodiments, Ry1is hydrogen. In some embodiments, Ry1is C1alkyl. In some embodiments, Ry1is C2alkyl. In some embodiments, Ry1is C3alkyl. In some embodiments, Ry1is C4alkyl. In some embodiments, Ry1is C5alkyl. In some embodiments, Ry1is C6alkyl. In some embodiments, the branching unit (YY) is

[0202] In some embodiments, the wavy line to M of Formula (Ila) indicates the point of covalent attachment to Ab and the wavy line to G of Formula (Ila) indicates the point of covalent attachment to D. In some embodiments, the wavy line to G of Formula (Ila)indicates the point of covalent attachment to a secondary alcohol group or a secondary amine group of D. In some embodiments, the secondary alcohol group is the alcohol group of a phenol group of D. In some embodiments, the secondary amine group is the imido nitrogen of a glutarimide group of D. In some embodiments, the secondary amine group is the amine nitrogen of a piperazine group of D.

[0203] In some embodiments, L is a linker of Formula (lib) :wherein subscript dd is 1 or 2;M is selected from the group consisting of:whereinRb1and Rb2are each independently hydrogen or C1-C6alkyl, or Rb1and Rb2together with the carbon to which they are attached form a C4-C6cycloalkyl or a C4-C6heterocycloalkyl;Rb3and Rb4are each independently hydrogen or C1-C6alkyl, subscript si is 0 or 1, wherein the dashed line indicates the point of covalent attachment to the Ab and the wavy line indicates the point of covalent attachment to the remainder of the structure of L;U is absent or is -(CH2)b(Rv1)ss(C=O)u(NH)v-, wherein subscript b is 0, 1, 2, 3, 4, or 5; subscript ss is 0 or 1; subscript u is 0 or 1; subscript v is 0 or 1;Rv1is -C3-C6cycloalkyl- or -C3-C6cycloalkyl-C(O)NHCH2-Rv2-, wherein Rv2is C3-C6cycloalkyl, C3-C6heterocycle, or C3-C6heteroaryl; or-(CH2CH2O)wCH2CH2(NH)-, wherein subscript w is an integer ranging from 1 to 16;X is absent or is-(CH2CH2O)wCH2CH2-(C=O)d-, wherein subscript w is an integer ranging from 0 to 16 and subscript d is 0 or 1;-CH(Rx1)(CH2)nnC(O)-, wherein Rx1is hydrogen, -COOH, - C(O)NHCH3, or -(C(O)NHCH2)x(CH2OCH2)yRx2, wherein Rx2is - CH2NHC(O)CH3, - CH2NH2, or - CH2C(O)ORx2a, wherein Rx2ais hydrogen or C1-C6alkyl; subscript nn is an integer ranging from 1 to 6, and subscript x and subscript y are each independently an integer ranging from 0 to 8;-C(O)-C(Rx3)(Rx4)-C(O)-, wherein Rx3and Rx4are each independently hydrogen or C1-C6alkyl or Rx3and Rx4together with the carbon to which they are attached form a C3-C6cycloalkyl;-heterocycloalkyl-O(CH2)iC(O)-, wherein subscript I is an integer ranging from 0 to 6;-C(O)-C(Rx5)(Rx6)-OC(O)-, wherein Rx5is hydrogen or C1-C6alkyl,Rx6is hydrogen, C1-C6alkyl,, wherein subscript f is an integer ranging from 0 to 4, and each Rx7is independently hydrogen, - COOH, -NH2, C1-C6alkyl, or an independently selected side chain of an amino acid; or-(CH2CH2O)yyCH2CH2NHC(O)CH2OCH2C(O) - wherein subscript yy is an integer ranging from 0 to 16;YY is a branching unit, wherein when subscript dd is 1, YY has the structure of:wherein each qq is independently -N(Ry1)- or -O-, wherein Ry1is hydrogen or C1-C6alkyl, and wherein subscript dd is 2, YY has the structure of:wherein qq1and qq2are each independently -N(Ry1)- or -O-, wherein Ry1is hydrogen or C1-C6alkyl, and the wavy line of YY indicates the point of attachment to X, when present, or U, when X is absent, or M, when X and U are absent; and the dashed lines of YY indicate the point of attachment to EE when EE is present, or to AA when EE is absent, or to J when AA and EE are absent, or to G when AA, EE, and J are absent, and to NN;NN is -(CH2CH2O)k’CH2CH2C(O)-Rnn1-, wherein subscript k’ is an integer ranging from 0 to 16 and Rnn1is hydrogen, C1-C6alkyl, or -OH; each EE is independently absent or -(CH2CH2O)XCH2CH2C(O)-, wherein subscript x’n integer ranging from 0 to 16; each AA is independently absent or has the structure of:wherein subscript c is an integer ranging from 1 to 12; each Ra1is independently -COOH, -NH2, or an independently selected side chain of an amino acid; each J is independently absent, -(Rj3)N(C(Rj1)(Rj2))m1, or has the structure of.wherein Rj3is hydrogen, C1-C6alkyl, or C3-C6cycloalkyl; each Rj1and Rj2is independently hydrogen, C1-C6alkyl, C3-C6cycloalkyl, - OH, or -NRj4Rj5, wherein Rj4and Rj5are each -OH or C1-C6alkyl; subscript ml is an integer ranging from 1 to 6; each Rjis independently halogen, C1-C6alkyl, or -C(O)NH(C1-C6alkyl); subscript k is an integer ranging from 0 to 4;wherein the wavy line to M of Formula (lib) indicates the point of covalent attachment to Ab and the wavy line to G of Formula (lib) indicates the point of covalent attachment to an independently selected D.

[0204] In some embodiments, qq1and qq2are each -N(Ry1)-, wherein Ry1is hydrogen or C1- C6alkyl. In some embodiments, qq1and qq2are each -O-. In some embodiments, qq1is - N(Ry1)-, wherein Ry1is hydrogen or C1-C6alkyl, and qq2is-O- In some embodiments, Ry1is hydrogen.

[0205] In some embodiments, YY is:wherein Ry1is hydrogen or C1-C6alkyl.

[0206] In some embodiments, the linker of Formula (lib) has the structure of:wherein qq1and qq2are each independently -N(Ry1)- or -O-, wherein Ry1is hydrogen or C1- C6alkyl.

[0207] In some embodiments, L is a linker of Formula (lib) has the structure of:wherein the dashed line indicates the point of covalent attachment to the Ab and the wavy line indicates the point of covalent attachment to the remainder of the structure of the linker;U is -(CH2)b(Rv1)ss(C=O)u(NH)v- wherein subscript b is 1, 2, 3, 4, or 5; subscript ss is 0; subscript u is 0 or 1; and subscript v is 0 or 1; or-(CH2CH2O)wCH2CH2(NH)-, wherein subscript w is an integer ranging from 1 to 16;X is -(CH2CH2O)wCH2CH2-(C=O)d- wherein subscript w is an integer ranging from 0 to 16 and subscript d is 0 or 1; qq1and qq2are each independently -N(Ry1)- or -O-, wherein Ry1is hydrogen or C1-C6alkyl;NN is -(CH2CH2O)k’CH2CH2C(O)-Rnn1- wherein subscript k’ is an integer ranging from 0 to 16 and Rnn1is hydrogen, C1-C6alkyl, or -OH;EE is absent or is -(CH2CH2O)XCH2CH2C(O)-, wherein subscript x’ is an integer ranging from 0 to 16;A A is absent or has the structure of:wherein subscript c is an integer ranging from 1 to 12; each Ra1is independently -COOH, -NH2, or an independently selected side chain of an amino acid;each J is independently absent or has the structure of:wherein each Rjis independently halogen, C1-C6alkyl, or -C(O)NH(C1-C6alkyl); and subscript k is an integer ranging from 0 to 4;G is absentwherein the wavy line to M indicates the point of covalent attachment to Ab and the wavy line to G indicates the point of covalent attachment to an independently selected D.

[0208] In some embodiments, the wavy line to M of Formula (lib) indicates the point of covalent attachment to Ab and the wavy line to G of Formula (lib) indicates the point of covalent attachment to an independently selected D. In some embodiments, the wavy line to G of Formula (lib) indicates the point of covalent attachment to a secondary alcohol group, a secondary amine group of D, or any combination thereof. In some embodiments, the secondary alcohol group is the alcohol group of a phenol group of D. In some embodiments, the secondary amine group is the imido nitrogen of a glutarimide group of D. In some embodiments, the secondary amine group is the amine nitrogen of a piperazine group of D.

[0209] In some embodiments, L is a linker of Formula (III):whereinM is selected from the group consisting of:whereinRb1and Rb2are each independently hydrogen or C1-C6alkyl, or Rb1and Rb2together with the carbon to which they are attached form a C4-C6cycloalkyl or a C4-C6heterocycloalkyl;Rb3and Rb4are each independently hydrogen or C1-C6alkyl, subscript si is 0 or 1, wherein the dashed line indicates the point of covalent attachment to the Ab and the wavy line indicates the point of covalent attachment to the remainder of the structure of L;U is absent or is -(CH2)b(Rv1)ss(C=O)u(NH)v-, wherein subscript b is 0, 1, 2, 3, 4, or 5; subscript ss is 0 or 1; subscript u is 0 or 1; subscript v is 0 or 1;Rv1is -C3-C6cycloalkyl- or -C3-C6cycloalkyl-C(O)NHCH2-Rv2-, whereinRv2is C3-C6cycloalkyl, C3-C6heterocycle, or C3-C6heteroaryl; or -(CH2CH2O)wCH2CH2(NH)-, wherein subscript w is an integer ranging from 1 to 16;X is absent or is-(CH2CH2O)wCH2CH2-(C=O)d-, wherein subscript w is an integer ranging from 0 to 16 and subscript d is 0 or 1;-CH(Rx1)(CH2)nC(O)-, wherein Rx1is hydrogen, -COOH, - C(O)NHCH3, or -(C(O)NHCH2)x(CH2OCH2)yRx2, wherein Rx2is - CH2NHC(O)CH3, - CH2NH2, or - CH2C(O)ORx2a, wherein Rx2ais hydrogenor C1-C6alkyl; subscript nn is an integer ranging from 1 to 6, and subscript x and subscript y are each independently an integer ranging from 0 to 8;-C(O)-C(Rx3)(Rx4)-C(O)-, wherein Rx3and Rx4are each independently hydrogen or C1-C6alkyl or Rx3and Rx4together with the carbon to which they are attached form a C3-C6cycloalkyl;-heterocycloalkyl-O(CH2)iC(O)-, wherein subscript i is an integer ranging from 0 to 6;-C(O)-C(Rx5)(Rx6)-OC(O)-, wherein Rx5is hydrogen or C1-C6alkyl,Rx6is hydrogen, C1-C6alkyl,wherein subscript f is an integer ranging from 0 to 4, and each Rx7is independently hydrogen, - COOH, -NH2, C1-C6alkyl, or an independently selected side chain of an amino acid; or-(CH2CH2O)yyCH2CH2NHC(O)CH2OCH2C(O) -, wherein subscript yy is an integer ranging from 0 to 16;YY is a branching unit selected from the group consisting of:wherein each qq is independently -N(Ry1)- or -O-, wherein Ry1is hydrogen or C1-C6alkyl; and wherein the wavy line indicates the point of attachment to X, when present, or U, when X is absent, or M, when X and U are absent; and each dashed line indicates the point of attachment to ZZ when ZZ is present, or to AA when ZZ is absent, or to J when AA and ZZ are absent, or to G when AA, ZZ, and J are absent; each ZZ is independently -(CH2CH2O)wCH2CH2C(O)-, wherein subscript w’ is an integer ranging from 0 to 16;each AA is independently absent or has the structure of:wherein subscript c is an integer ranging from 1 to 12; each Ra1is independently -COOH, -NH2, or an independently selected side chain of an amino acid; each J is independently absent, -(Rj3)N(C(Rj1)(Rj2))m1, or has the structure of.wherein Rj3is hydrogen, C1-C6alkyl, or C3-C6cycloalkyl; each Rj1and Rj2is independently hydrogen, C1-C6alkyl, C3-C6cycloalkyl, - OH, or -NRj4Rj5, wherein Rj4and Rj5are each -OH or C1-C6alkyl; subscript ml is an integer ranging from 1 to 6; each Rjis independently halogen, C1-C6alkyl, or -C(O)NH(C1-C6alkyl); subscript k is an integer ranging from 0 to 4; each G is independently absent,wherein the wavy line to M of Formula (III) indicates the point of covalent attachment to Ab and the wavy line to each G of Formula (III) indicates the point of covalent attachment to D, wherein subscript z is an integer ranging from 1 to 14.

[0210] In some embodiments, YY is a branching unit selected from the group consisting of:wherein each qq is independently -N(Ry1)- or -O-, wherein Ry1is hydrogen or C1-C6alkyl.

[0211] In some embodiments, the branching unit (YY) is

[0212] In some embodiments, the branching unit (YY) iseach Ry1is independently hydrogen or C1-C6alkyl. In some embodiments, Ry1is hydrogen. In some embodiments, Ry1is C1alkyl. In some embodiments, Ry1is C2alkyl. In some embodiments, Ry1is C3alkyl. In some embodiments, Ry1is C4alkyl. In some embodiments, Ry1is C5alkyl. In some embodiments, Ry1is C6alkyl.

[0213] In some embodiments, the branching unit (YY) is

[0214] In some embodiments, the branching unit (YY) is an at least tri -substituted carbocycle, an at least tri -substituted heterocycle, a tertiary carbon atom, or a tertiary nitrogen atom. In some embodiments, the branching unit comprises at least three functional groups independently selected from the group consisting of an amine, a carboxylate, a thiocarboxylate, hydroxyl, thiol, carbamate, thiocarbamate, sulfonate, sulfonamide, phosphonate, and phosphinate.

[0215] In some embodiments, each ZZ is independently -(CH2CH2O)wCH2CH2C(O)-, wherein subscript w’ is an integer ranging from 0 to 16. In some embodiments, ZZ is - (CH2CH2O)W CH2CH2C(O)- , wherein w’ is an integer ranging from 0 to 8. In some embodiments, ZZ has the structure of:

[0216] In some embodiments, the linker of Formula (III) has the structure of:whereinM isU is absent or is -(CH2)b(Rv1)ss(C=O)u(NH)v-, wherein subscript b is 0, 1, 2, 3, 4, or 5; subscript ss is 0 or 1; subscript u is 0 or 1; subscript v is 0 or 1; Rv1is -C3-C6cycloalkyl- or -C3-C6cycloalkyl-C(O)NHCH2-Rv2wherein Rv2is C3-C6cycloalkyl, C3-C6heterocycle, or C3-C6heteroaryl; or -(CH2CH2O)wCH2CH2(NH)-, wherein subscript w is an integer ranging from 1 to 16;X is absent or is -(CH2CH2O)wCH2CH2-(C=O)d-, wherein subscript w is an integer ranging from 0 to 16 and subscript d is 0 or 1; each ZZ is independently -(CH2CH2O)wCH2CH2C(O)-, wherein subscript w’ is an integer ranging from 0 to 16; each AA is independently absent or has the structure of:wherein subscript c is an integer ranging from 1 to 12; each Ra1is independently -COOH, -NH2, or an independently selected side chain of an amino acid; each J is independently absent, -(Rj3)N(C(Rj1)(Rj2))m1, or has the structure of.wherein Rj3is hydrogen, C1-C6alkyl, or C3-C6cycloalkyl; each Rj1and Rj2is independently hydrogen, C1-C6alkyl, C3-C6cycloalkyl, -OH, or -NRj4R5, wherein Rj4and Rj5are each -OH or C1-C6alkyl; subscript ml is an integer ranging from 1 to 6; each Rjis independently halogen, C1-C6alkyl, or -C(O)NH(C1-C6alkyl); subscript k is an integer ranging from 0 to 4; each G is independently absent,and wherein the wavy line to M of Formula (III) indicates the point of covalent attachment to Ab and the wavy lined to G of Formula (III) indicates the point of covalent attachment to D. In some embodiments, the wavy lined to G of Formula (III) indicates the point of covalent attachment to a secondary alcohol group or secondary amine group of Formula (IA) of the degrader compound (D).

[0217] In some embodiments, the linker has the structure of:whereinU is absent or is -(CH2)b(Rv1)ss(C=O)u(NH)v-, wherein subscript b is 0, 1, 2, 3, 4, or 5; subscript ss is 0 or 1; subscript u is 0 or 1; subscript v is 0 or 1; Rv1is -C3-C6cycloalkyl- or -C3-C6cycloalkyl-C(O)NHCH2-Rv2wherein Rv2is C3-C6cycloalkyl, C3-C6heterocycle, or C3-C6heteroaryl; or -(CH2CH2O)wCH2CH2(NH)- wherein subscript w is an integer ranging from 1 to 16;X is absent or is-(CH2CH2O)wCH2CH2-(C=O)d-, wherein subscript w is an integer ranging from 0 to 8 and subscript d is 0 or 1; subscript c is an integer ranging from 1 to 12 and each Ra1is -COOH, -NH2, or an independently selected side chain of an amino acid, wherein each amino acid is selected from the group consisting of alanine, valine, citrulline, glutamic acid, tryptophan, glycine, phenylalanine, and lysine; each Rjis independently halogen, C1-C6alkyl, or -C(O)NH(C1-Ce alkyl); and subscript k is an integer ranging from 0 to 4.

[0218] In some embodiments, the linker has the structure of:whereinU is absent or is -(CH2)b(Rv1)ss(C=O)uCNH)v- wherein subscript b is 0, 1, 2, 3, 4, or 5; subscript ss is 0 or 1; subscript u is 0 or 1; subscript v is 0 or 1; Rv1is -C3-C6cycloalkyl- or -C3-C6cycloalkyl-C(O)NHCH2-Rv2wherein Rv2is C3-C6cycloalkyl, C3-C6heterocycle, or C3-C6heteroaryl; or -(CH2CH2O)wCH2CH2(NH)-, wherein subscript w is an integer ranging from 1 to 16;X is absent or is -(CH2CH2O)wCH2CH2-(C=O)d-, wherein subscript w is an integer ranging from 0 to 8 and subscript d is 0 or 1; subscript c is an integer ranging from 1 to 12 and each Ra1is -COOH, -NH2, or an independently selected side chain of an amino acid, wherein each amino acid is selected from the group consisting of alanine, valine, glutamic acid, citrulline, tryptophan, glycine, phenylalanine, and lysine.

[0219] In some embodiments, the linker has the structure of:

[0220] In some embodiments, the linker has the structure of:

[0221] In some embodiments, L is a linker of Formula (III), and each D is independently a degrader compound of Formula (I). In some embodiments, each D independently comprises a small molecule E3 Ubiquitin Ligase binding moiety that binds a Von Hippel-Lindau E3 Ubiquitin Ligase. In some embodiments, each D independently comprises a small molecule E3 Ubiquitin Ligase binding moiety that binds a Cereblon E3 Ubiquitin Ligase. In some embodiments, one D comprises a small molecule E3 Ubiquitin Ligase binding moiety that binds a Von Hippel-Lindau E3 Ubiquitin Ligase, and the other D comprises a small molecule E3 Ubiquitin Ligase binding moiety that binds a Cereblon E3 Ubiquitin Ligase. In some embodiments, each D is the same degrader compound of Formula (I). In some embodiments,each D is a different degrader compound of Formula (I). In some embodiments, each D has a structure of:wherein the wavy line indicates the point of covalent attachment to L. In some embodiments, each D has a structure of:wherein the wavy line indicates the point of covalent attachment to L. In some embodiments, each D has a structure of:wherein the wavy line indicates the point of covalent attachment to L. In some embodiments, each D has a structure ofwherein the wavy line indicates the point of covalent attachment to L. In some embodiments, each D has a structure ofwherein the wavy line indicates the point of covalent attachment to L. In some embodiments, each D has a structure ofwherein the wavy line indicates the point of covalent attachment to L. In some embodiments, each D has a structure ofwherein the wavy line indicates the point of covalent attachment to L.Degrader Compounds (D)

[0222] Exemplary degrader compounds that can be used in the antibody-drug conjugates and drug-linker compounds provided herein are described in WO 2021 / 252666, WO 2022 / 099117, WO 2023 / 287787, WO 2023 / 220577, PCT / US2023 / 074324, and PCT / US2023 / 074324, each of which is incorporated herein by reference in its entirety.

[0223] In some aspects, provided is an antibody-drug conjugate or a drug-linker compound comprising a degrader compound, wherein the degrader compound is of Formula (I):or a pharmaceutically acceptable salt or solvate thereof, wherein PTM (Protein Targeting Moiety) is a moiety of Formula IA:whereinR1is a covalent bond or a chemical moiety that links PTM and ULM;* is a point of attachment to ULM; n = 0-3; each W is independently optionally substituted -CH2-, -C(O)-, -S(O)-, or -S(O)2-, wherein when n = 2 or 3, only one W is -C(O)-, -S(O)-, or -S(O)2- and the other W are -CH2- or substituted -CH2-;Rc1and Rd1are independently H, deuterium, Halo, C1-3alkyl, C1-3haloalkyl, or C1-4alkoxyl;Re3is H, -C(O)Rf, -CH2-O-P(O)(ORg)2, or -P(O)(ORg)2; wherein Rfand Rgare independently H, C1-4alkyl, C1-4substituted alkyl, C3-8cyclcoalkyl, C3-8substituted cyclcoalkyl, C3-8heterocyclcoalkyl, or C3-8substituted heterocyclcoalkyl;Z and Y are each independently N, or CRhwherein Rh= H, C1-3alkyl, or absent or, if R1is attached to Z, then Z is C and Y is N or CRhwherein Rhis H or C1-3alkyl; or if R1is attached to Y, then Y is C and Z is N or CRhwherein Rhis H or C1-3alkyl;B is an optionally substituted 5-7 membered cycloalkyl ring, an optionally substituted 5-7 membered heteroaryl ring, or an optionally substituted 5-7 membered heterocyclic ring, wherein ring B is fused to ring G through Y and Z; and ULM is a small molecule E3 Ubiquitin Ligase binding moiety that binds a Von Hippel-Lindau E3 Ubiquitin Ligase or a Cereblon E3 Ubiquitin Ligase.PTM

[0224] In some aspects, the degrader compounds of Formula I includes a PTM. According to the disclosure, the PTM in the degrader compounds of Formula I is a moiety of Formula IA

[0225] According to the disclosure, B is a ring fused to ring “G” via Y and Z.

[0226] In some aspects, B in Formula IA is an optionally substituted 5-7 membered cycloalkyl ring, an optionally substituted 5-7 membered heteroaryl ring, or an optionally substituted 5-7 membered heterocyclic ring. In some embodiments, B in Formula IA is an optionally substituted 5-7 membered cycloalkyl ring. In some embodiments, B in Formula IA is an unsubstituted 5-7 membered cycloalkyl ring. In some embodiments, B is Formula IA is a substituted 5-7 membered cycloalkyl ring wherein the substituents are hydroxy, halogen, alkoxy, alkyl, haloalkyl, amino, alkylamino, or cyano.

[0227] In some embodiments, B in Formula IA is an unsubstituted 5-7 membered heteroaryl ring. In some embodiments, B in Formula IA is an unsubstituted 5-7 membered heteroaryl ring. In some embodiments, B in Formula IA is a substituted 5-7 membered heteroaryl ring,wherein substituents are hydroxy, halogen, alkoxy, alkyl, haloalkyl, amino, alkylamino, or cyano.

[0228] In other embodiments, B in Formula IA is an unsubstituted 5-7 membered heterocyclic ring. In some embodiments, B in Formula IA is an unsubstituted 5-7 membered heterocyclic ring. In some embodiments, B in Formula IA is a substituted 5-7 membered heterocyclic ring, wherein the substituents are hydroxy, halogen, alkoxy, alkyl, haloalkyl, amino, alkylamino, cyano.

[0229] In some aspects, n in Formula IA is 0, 1, 2 or 3. In some embodiments, n = 0. In other embodiments, n = 1. In other embodiments, n = 2. In other embodiments, n = 3.

[0230] In some aspects, each W in Formula IA is independently optionally substituted -CH2-, -C(O)-, -S(O)-, or -S(O)2-, wherein when n = 2 or 3, only one W may be -C(O)-, -S(O)-, or - S(O)2- and the other W are -CH2- or substituted -CH2-. Preferred substituents when W is substituted -CH2- include deuterium, C1-salkyl, C1-shaloalkyl, and C1-4alkoxyl.

[0231] In some embodiments, W in Formula IA is optionally substituted -CH2-. In other embodiments, W in Formula IA is -CH2-. Preferred substituents when W is substituted -CH2- include deuterium, C1-3alkyl, C1-shaloalkyl, and C1-4alkoxyl. In some embodiments, W in Formula IA is -C(O)-. In some embodiments, W in Formula IA is -S(O)-. In some embodiments, W in Formula IA is -S(O)2-. In embodiments of the disclosure wherein n is 2 or 3, then only one W may be -C(O)-, -S(O)-, or -S(O)2- and the other W are -CH2- or substituted -CH2-. Preferred substituents when W is substituted -CH2- include deuterium, C1- salkyl, C1-3haloalkyl, and C1-4alkoxyl.

[0232] In some aspects, Rc1and Rd1in Formula IA are independently H, deuterium, halo, C1-3alkyl, C1-3haloalkyl, or C1-4alkoxyl. In some embodiments, Rc1is H. In some embodiments, Rc1is deuterium. In some embodiments, Rc1is halo, e.g., -F, -Cl, -Br, or -I. In some embodiments, Rc1is C1-3alkyl, e.g., -C1alkyl, -C2alkyl, -C3alkyl, -CH3, -CH2CH3, and the like. In some embodiments, Rc1is C1-3haloalkyl, e.g., -C1haloalkyl, -C2haloalkyl, -C3haloalkyl, -CF3, -CH2CF3, and the like. In some embodiments, Rc1is C1-4alkoxyl, e.g., -C1alkoxyl, -C2alkoxyl, -C3alkoxyl, -C4alkoxyl, -OCH3, -OCH2CH3, and the like. In some embodiments, Rd1is H. In some embodiments, Rd1is deuterium. In some embodiments, Rd1is halo, e.g., -F, -Cl, -Br, or -I. In some embodiments, Rd1is C1-3alkyl, e.g., -C1alkyl, -C2alkyl, -C3alkyl, -CH3, -CH2CH3, and the like. In some embodiments, Rd1is C1-3haloalkyl, e.g., -C1haloalkyl, -C2haloalkyl, -C3haloalkyl, -CF3, -CH2CF3, and the like. In some embodiments, Rd1is C1-4alkoxyl, e.g., -C1alkoxyl, -C2alkoxyl, -C3alkoxyl, -C4alkoxyl, -OCH3, - OCH2CH3, and the like.

[0233] In some aspects, Re3in Formula IA is H, -C(O)Rf, or -P(O)(ORg)2; wherein Rfand Rgare independently H, C1-4alkyl, C1-4substituted alkyl, C3-8cyclcoalkyl, C3-8substituted cyclcoalkyl, C3-8heterocyclcoalkyl, or C3-8substituted heterocyclcoalkyl. In some embodiments, Re3is H.

[0234] In other embodiments, Re3is -C(O)Rfwherein Rfis H, C1-4alkyl, C1-4substituted alkyl, C3-8cyclcoalkyl, C3-8substituted cyclcoalkyl, C3-8heterocyclcoalkyl, or C3-8substituted heterocyclcoalkyl. In other embodiments, Re3is -C(O)Rfwherein Rfis H. In other embodiments, Re3is -C(O)Rfwherein Rfis C1-4alkyl, e.g., -C1alkyl, -C2alkyl, -C3alkyl, -C4alkyl, -CH3, -CH2CH3, and the like. In other embodiments, Re3is -C(O)Rfwherein Rfis C1-4substituted alkyl, e.g., -C1substituted alkyl, -C2substituted alkyl, -C3substituted alkyl, and - C4substituted alkyl. In other embodiments, Re3is -C(O)Rfwherein Rfis C3-8cyclcoalkyl, e.g., C3cyclcoalkyl, C4cyclcoalkyl, C5cyclcoalkyl, C6cyclcoalkyl, C7cyclcoalkyl, and C8cyclcoalkyl. In other embodiments, Re3is -C(O)Rfwherein Rfis C3-8substituted cyclcoalkyl, e.g., C3substituted cyclcoalkyl, C4substituted cyclcoalkyl, C5substituted cyclcoalkyl, C6substituted cyclcoalkyl, C7substituted cyclcoalkyl, and C8substituted cyclcoalkyl.

[0235] In other embodiments, Re3is -C(O)Rfwherein Rfis C3-8heterocyclcoalkyl, e.g., C3heterocyclcoalkyl, C4heterocyclcoalkyl, C5heterocyclcoalkyl, C6heterocyclcoalkyl, C7heterocyclcoalkyl, and C8heterocyclcoalkyl. In other embodiments, Re3is -C(O)Rfwherein Rfis C3-8substituted heterocyclcoalkyl, e.g., C3substituted heterocyclcoalkyl, C4substituted heterocyclcoalkyl, C5substituted heterocyclcoalkyl, C6substituted heterocyclcoalkyl, C7substituted heterocyclcoalkyl, and C8substituted heterocyclcoalkyl.

[0236] In other embodiments, Re3is -P(O)(ORg)2; wherein each Rgis independently H, C1-4alkyl, C1-4substituted alkyl, C3-8cyclcoalkyl, C3-8substituted cyclcoalkyl, C3-8heterocyclcoalkyl, or C3-8substituted heterocyclcoalkyl. In other embodiments, Re3is - P(O)(ORg)2; wherein each Rgis H. In other embodiments, Re3is -P(O)(ORg)2; wherein each Rgis C1-4alkyl, e.g., -C1alkyl, -C2alkyl, -C3alkyl, -C4alkyl, -CH3, -CH2CH3, and the like. In other embodiments, Re3is -P(O)(ORg)2; wherein one Rgis H and the other Rgis C1-4alkyl, e.g., -C1alkyl, -C2alkyl, -C3alkyl, -C4alkyl, -CH3, -CH2CH3, and the like. In other embodiments, Re3is -P(O)(ORg)2; wherein at least one Rgis C1-4substituted alkyl, e.g., -C1substituted alkyl, -C2substituted alkyl, -C3substituted alkyl, and -C4substituted alkyl. In other embodiments, Re3is -P(O)(ORg)2; wherein at least one Rgis C3-8cyclcoalkyl, e.g., C3cyclcoalkyl, C4cyclcoalkyl, C5cyclcoalkyl, C6cyclcoalkyl, C7cyclcoalkyl, and C8cyclcoalkyl. In other embodiments, Re3is -P(O)(ORg)2; wherein at least one Rgis C3-8substituted cyclcoalkyl, e.g., C3substituted cyclcoalkyl, C4substituted cyclcoalkyl, C5substituted cyclcoalkyl, C6substituted cyclcoalkyl, C7substituted cyclcoalkyl, and C8substituted cyclcoalkyl. In other embodiments, Re3is -P(O)(0Rg)2; wherein at least one Rgis C3-8heterocyclcoalkyl, e.g., C3heterocyclcoalkyl, C4heterocyclcoalkyl, C5heterocyclcoalkyl, C6heterocyclcoalkyl, C7heterocyclcoalkyl, and C8heterocyclcoalkyl. In other embodiments, Re3is -P(O)(0Rg)2; wherein at least one Rgis C3-8substituted heterocyclcoalkyl, e.g., C3substituted heterocyclcoalkyl, C4substituted heterocyclcoalkyl, C5substituted heterocyclcoalkyl, C6substituted heterocyclcoalkyl, C7substituted heterocyclcoalkyl, and C8substituted heterocyclcoalkyl. In other embodiments, Re3is -CH2- 0-P(O)(0Rg)2; wherein each Rgis H. In other embodiments, Re3is -CH2-O-P(O)(ORg)2; wherein each Rgis C1-4alkyl, e.g., -C1alkyl, -C2alkyl, -C3alkyl, -C4alkyl, -CH3, -CH2CH3, and the like. In other embodiments, Re3is -CH2-O-P(O)(ORg)2; wherein one Rgis H and the other Rgis C1-4alkyl, e.g., -C1alkyl, -C2alkyl, -C3alkyl, -C4alkyl, -CH3, -CH2CH3, and the like. In other embodiments, Re3is -CH2-O-P(O)(ORg)2; wherein at least one Rgis C1-4substituted alkyl, e.g., -C1substituted alkyl, -C2substituted alkyl, -C3substituted alkyl, and - C4substituted alkyl. In other embodiments, Re3is -CH2-O-P(O)(ORg)2; wherein at least one Rgis C3-8cyclcoalkyl, e.g., C3cyclcoalkyl, C4cyclcoalkyl, C5cyclcoalkyl, C6cyclcoalkyl, C7cyclcoalkyl, and C8cyclcoalkyl. In other embodiments, Re3is -CH2-O-P(O)(ORg)2; wherein at least one Rgis C3-8substituted cyclcoalkyl, e.g., C3substituted cyclcoalkyl, C4substituted cyclcoalkyl, C5substituted cyclcoalkyl, C6substituted cyclcoalkyl, C7substituted cyclcoalkyl, and C8substituted cyclcoalkyl. In other embodiments, Re3is -CH2-O- P(O)(0Rg)2; wherein at least one Rgis C3-8heterocyclcoalkyl, e.g., C3heterocyclcoalkyl, C4heterocyclcoalkyl, C5heterocyclcoalkyl, C6heterocyclcoalkyl, C7heterocyclcoalkyl, and C8heterocyclcoalkyl. In other embodiments, Re3is -CH2-O-P(O)(ORg)2; wherein at least one Rgis C3-8substituted heterocyclcoalkyl, e.g., C3substituted heterocyclcoalkyl, C4substituted heterocyclcoalkyl, C5substituted heterocyclcoalkyl, C6substituted heterocyclcoalkyl, C7substituted heterocyclcoalkyl, and C8substituted heterocyclcoalkyl.

[0237] In some aspects, Z and Y in Formula IA are each independently N or CRh, wherein Rh= H or C1-3alkyl or may be absent when n = 1-3 such that a double bond is formed between Z and Y, or, if R1is attached to Z, then Z is C and Y is N or CRhwherein Rhis H or C1-3alkyl; or if R1is attached to Y, then Y is C and Z is N or CRhwherein Rhis H or C1-3alkyl . Examples of these embodiments include:

[0238] In some embodiments, Z is N. In other embodiments, Z is CRhwherein Rh= H or C1-3alkyl. In other embodiments, Z is CRhwherein Rh= H. In other embodiments, Z is CRhwherein Rh= H or C1-3alkyl. In other embodiments, Z is CRhwherein Rh= methyl. In other embodiments, Z is CRhwherein Rh= ethyl. In other embodiments, Z is CRhwherein Rh= propyl.

[0239] In other embodiments, Z is CRhwherein Rh= absent, and Z is bonded to Y by a double bond. In some embodiments, Z is C and is attached to R1.

[0240] In some embodiments, Y is N. In other embodiments, Y is CRhwherein Rh= H or C1- 3 alkyl. In other embodiments, Y is CRhwherein Rh= absent, and Y is bonded to Z by a double bond. In some embodiments, Y is C and is attached to R1. In other embodiments, Y is CRhwherein Rh= H. In other embodiments, Y is CRhwherein Rh= H or C1-3alkyl. In other embodiments, Y is CRhwherein Rh= methyl. In other embodiments, Y is CRhwherein Rh= ethyl. In other embodiments, Y is CRhwherein Rh= propyl.

[0241] In some embodiments, the PTM is a moiety of Formula IA wherein * is a point of attachment to ULM. In some aspects, R1in Formula IA is a covalent bond, or chemical moiety that links PTM and ULM.

[0242] In some embodiments, R1in Formula IA is a covalent bond. In other embodiments, R1in Formula IA is a chemical moiety that links PTM and ULM.

[0243] Chemical moieties that are used to link PTM and ULM moieties are known in the art. In some embodiments, R1in Formula IA is a chemical moiety that is used to link a PTM and ULM that is known in the art.

[0244] In some embodiments, R1in Formula IA is a chemical moiety that is used to link a PTM and ULM as described in U.S. Patent Application Publication No. 2019 / 0300521, the entirety of which is incorporated by reference herein. In other embodiments, R1in Formula IA is a chemical moiety that is used to link a PTM and ULM as described in U.S. Patent Application Publication No. 2019 / 0255066, the entirety of which is incorporated by reference herein. In other embodiments, R1in Formula IA is a chemical moiety that is used to link a PTM and ULM as described in WO 2019 / 084030, the entirety of which is incorporated by reference herein. In other embodiments, R1in Formula IA is a chemical moiety that is used to link a PTM and ULM as described in WO 2019 / 084026, the entirety of which is incorporated by reference herein.

[0245] In some embodiments, R1in Formula IA is a chemical structural unit represented by the formula:-(A)q-, wherein: q is an integer from 1 to 14; each A is independently selected from the group consisting of a bond, CR1aR1b, O, S, SO, SO2, NR1c, SO2NR1c, SONR1c, SO(=NR1c), SO(=NR1c)NR1d, CONR1c, NR1cCONR1d, NR1cC(O)O, NR1cSO2NR1d, CO, CR1a=CR1b, C=C, SiR1aR1b, P(O)R1a, P(O)OR1a, (CR1aR1b)1-4, -(CR1aR1b)1-4O(CR1aR1b)1-4, -(CR1aR1b)1-4S(CR1aR1b)1-4, -(CR1aR1b)1-4NR(CR1aR1b)1-4, NR1cC(=NCN)NR1dNR1cC(=NCN), NR1cC(=CNO2)NR1d, 3-11 membered cycloalkyl, optionally substituted with 0-6 R1aand / or R1bgroups, 3-11 membered heteocyclyl optionally substituted with 0-6 R1aand / or R1bgroups, aryl optionally substituted with 0-6 R1aand / or R1bgroups, and heteroaryl optionally substituted with 0-6 R1aand / or R1bgroups, and R1a, R1b, R1c, R1dand R1eare each independently, -H, deuterium, -halo, -C1- Csalkyl, -C1-C6haloalkyl, -O-C1-C8alkyl, -S-C1-C8alkyl, -NHC1-C8alkyl, -N(C1-C8alkyl)2, 3- 11 membered cycloalkyl, aryl, heteroaryl, 3-11 membered heterocyclyl, -O-(3-11 membered cycloalkyl), -S-(3-11 membered cycloalkyl), NH-(3-11 membered cycloalkyl), N(3-11 membered cycloalkyl)2, N-(3-11 membered cycloalkyl)(C1-C8alkyl), -OH, -NH2, -SH, - SO2C1-C8alkyl, SO(NH)C1-C8alkyl, P(O)(OC1-C8alkyl)(C1-C8alkyl), -P(O)(OC1-C8alkyl)2, -C=C-C1-C8alkyl, -C=CH, -CH=CH(C1-C8alkyl), -C(C1-C8alkyl)=CH(C1-C8alkyl), -C(C1- C8alkyl)=C(C1-C8alkyl)2, -Si(OH)3, -Si(C1-C8alkyl)3, -Si(OH)(C1-C8alkyl)2, -C(O)C1-C8alkyl, -CO2H, -CN, -CF3, -CHF2, -CH2F, -NO2, -SF5, -SO2NHC1-C8alkyl, -SO2N(C1-C8alkyl)2, - SO(NH)NHC1-C8alkyl, -SO(NH)N(C1-C8alkyl)2, -SONHC1-C8alkyl, -SON(C1-C8alkyl)2, - CONHC1-C8alkyl, -CON(C1-C8alkyl)2, -N(C1-C8alkyl)CONH(C1-C8alkyl), -N(C1- C8alkyl)CON(C1-C8alkyl)2, -NHCONH(C1-C8alkyl), -NHCON(C1-C8alkyl)2, -NHCONH2, - N(C1-C8alkyl)SO2NH(C1-C8alkyl), -N(C1-C8alkyl)SO2N(C1-C8alkyl)2, -NHSO2NH(CI- C8alkyl), -NHSO2N(C1-C8alkyl)2, or -NHSO2NH2;or where the context permits, R1aor R1b, are linked to other groups, or to each other, to form a cycloalkyl and / or a heterocyclyl moiety, optionally substituted with 0-4 R1egroups.

[0246] In these embodiments, q represents the number of connected A groups. For example, when q = 1, -(A)q- is -A1-; when q = 2, -(A)q- is -A1-A2-; when q = 3, -(A)q- is -A1-A2-A3-; when q = 4, -(A)q- is -A1-A2-A3-A4-; when q = 5, -(A)q- is -A1-A2-A3-A4-A5-; when q = 6, - (A)q- is -A1-A2-A3-A4-A5-A6-; when q = 7, -(A)q- is -A1-A2-A3-A4-A5-A6-A7-; when q = 8, - (A)q- is -A1-A2-A3-A4-A5-A6-A7-A8-; when q = 9, -(A)q- is -A1-A2-A3-A4-A5-A6-A7-A8-A9-; when q = 10, -(A)q- is -A1-A2-A3-A4-A5-A6-A7-A8-A9-A10-; when q = 11, -(A)q- is -A1-A2- A3-A4-A5-A6-A7-A8-A9-A10-A11-; when q = 12, -(A)q- is -A1-A2-A3-A4-A5-A6-A7-A8-A9-A10- A11-A12-; when q = 13, -(A)q- is -A1-A2-A3-A4-A5-A6-A7-A8-A9-A10-A11-A12-A13-; and when q = 14, -(A)q- is -A1-A2-A3-A4-A5-A6-A7-A8-A9-A10-A11-A12-A13-A14-.

[0247] In some embodiments, q = 5 and R1is a chemical moiety represented by the formula: - A1-A2-A3-A4-A5-, wherein each of A1, A3and As is independently selected from the group consisting of a bond, -(CR1aR1b)0-4O(CR1aR1b)0-4, -(CR1aR1b)0-4S(CR1aR1b)0-4, -(CR1aR1b)0-4NR1c(CR1aR1b)0-4, -(CR1aR1b)0-4SO(CR1aR1b)0-4, -(CR1aR1b)0-4SO2(CR1aR1b)0-4, -(CR1aR1b)0-4SO2NR1c(CR1aR1b)0-4, -(CR1aR1b)0-4SONR1c(CR1aR1b)0-4, -(CR1aR1b)0-4SO(=NR1c)(CR1aR1b)0-4, -(CR1aR1b)0-4SO(=NR1c)NR1d(CR1aR1b)0-4, -(CR1aR1b)0-4CONR1c(CR1aR1b)0-4, -(CR1aR1b)0-4C(O)O(CR1aR1b)0-4, -(CR1aR1b)0-4NR1cCONR1d(CR1aR1b)0-4, -(CR1aR1b)0-4NR1cC(O)O(CR1aR1b)0-4, -(CR1aR1b)0-4NR1cSO2NR1d(CR1aR1b)0-4, -(CR1aR1b)0-4C(O)(CR1aR1b)0-4, -(CR1aR1b)0-4CR1a=CR1b(CR1aR1b)0-4, -(CR1aR1b)0-4C=C(CR1aR1b)0-4, - (CR1aR1b)0-4SiR1aR1b(CR1aR1b)0-4, -(CR1aR1b)0-4P(O)R1a(CR1aR1b)0-4, -(CR1aR1b)0-4P(O)OR1a(CR1aR1b)0-4, (CR1aR1b)1-4, optionally substituted 3-11 membered cycloalkyl, 3-11 membered heterocyclyl, aryl, and heteroaryl; wherein each of A2and A4is independently selected from the group consisting of is independently selected from the group consisting of a bond, (CR1aR1b)1-4, optionally substituted 3-11 membered cycloalkyl, 3-11 membered heterocyclyl, aryl, and heteroaryl; wherein R1aand R1bare each independently selected fromthe group consisting of -H, deuterium, -halo, -C1-C8alkyl, -O-C1-C8alkyl, -C1-C6haloalkyl , - S-C1-C8alkyl,-NHC1-C8alkyl, -N(C1-C8alkyl)2, 3-11 membered cycloalkyl, aryl, heteroaryl, 3-11 membered heterocyclyl, -O-(3-11 membered cycloalkyl), -S-(3-11 membered cycloalkyl), NH-(3-11 membered cycloalkyl), N(3-11 membered cycloalkyl)2, N-(3-11 membered cycloalkyl)(C1-C8alkyl), -OH, -NH2, -SH, -SO2C1-C8alkyl, SO(NH)C1-C8alkyl , P(O)(OC1-C8alkyl)(C1-C8alkyl), -P(O)(OC1-C8alkyl)2, -C=C-C1-C8alkyl, -C=CH, - CH=CH(C1-C8alkyl), -C(C1-C8alkyl)=CH(C1-C8alkyl), -C(C1-C8alkyl)=C(C1-C8alkyl)2, - Si(OH)3, -Si(C1-C8alkyl)3, -Si(OH)(C1-C8alkyl)2, -C(O)C1-C8alkyl, -CO2H, -CN, -NO2, -SF5, -SO2NHC1-C8alkyl, -SO2N(C1-C8alkyl)2, -SO(NH)NHC1-C8alkyl, -SO(NH)N(C1-C8alkyl)2, - SONHC1-C8alkyl, -SON(C1-C8alkyl)2, -CONHC1-C8alkyl, -CON(C1-C8alkyl)2, -N(C1- C8alkyl)CONH(C1-C8alkyl), -N(C1-C8alkyl)CON(C1-C8alkyl)2, -NHCONH(C1-C8alkyl), - NHCON(C1-C8alkyl)2, -NHCONH2, -N(C1-C8alkyl)SO2NH(C1-C8alkyl), -N(C1- C8alkyl)SO2N(C1-C8alkyl)2, -NHSO2NH(C1-C8alkyl), -NHSO2N(C1-C8alkyl)2, and - NHSO2NH2; and R1cand R1dare each independently selected from the group consisting of H, deuterium, optionally substituted C1-4alkyl, C3-8cyclcoalkyl, C3-8heterocyclcoalkyl, aryl, and heteroaryl.

[0248] In some embodiments, q = 4 and R1is a chemical moiety represented by the formula:-A1-A2-A3-A4-, wherein each of A1-4is independently selected from the group consisting of O, S, SO, SO2, NR1c, SO2NR1c, SONR1c, SO(=NR1c), SO(=NR1c)NR1d, CONR1c, NR1cCONR1d, NR1cC(O)O, NR1cSO2NR1d, CO, CR1a=CR1b, C=C, SiR1aR1b, P(O)R1a, P(O)OR1a, (CR1aR1b)1-4, -(CR1aR1b)1-4O(CR1aR1b)1-4, -(CR1aR1b)1-4S(CR1aR1b)1-4, -(CR1aR1b)1-4NR(CR1aR1b)1-4, optionally substituted 3-11 membered cycloalkyl, 3-11 membered heterocyclyl, aryl, and heteroaryl; wherein R1aand R1bare each independently selected from the group consisting of -H, deuterium, -halo, -C1-C8alkyl, -O-C1-C8alkyl, -C1-C6haloalkyl , -S-C1-C8alkyl,-NHC1- C8alkyl, -N(C1-C8alkyl)2, 3-11 membered cycloalkyl, aryl, heteroaryl, 3-11 membered heterocyclyl, -O-(3-11 membered cycloalkyl), -S-(3-11 membered cycloalkyl), NH-(3-11 membered cycloalkyl), N(3-11 membered cycloalkyl)2, N-(3-11 membered cycloalkyl)(C1- C8alkyl), -OH, -NH2, -SH, -SO2C1-C8alkyl, SO(NH)C1-C8alkyl , P(O)(OC1-C8alkyl)(C1- C8alkyl), -P(O)(OC1-C8alkyl)2, -C=C-C1-C8alkyl, -C=CH, -CH=CH(C1-C8alkyl), -C(C1- C8alkyl)=CH(C1-C8alkyl), -C(C1-C8alkyl)=C(C1-C8alkyl)2, -Si(OH)3, -Si(C1-C8alkyl)3, - Si(OH)(C1-C8alkyl)2, -C(O)C1-C8alkyl, -CO2H, -CN, -NO2, -SF5, -SO2NHC1-C8alkyl, - SO2N(C1-C8alkyl)2, -SO(NH)NHC1-C8alkyl, -SO(NH)N(C1-C8alkyl)2, -SONHC1-C8alkyl, - SON(C1-C8alkyl)2, -CONHC1-C8alkyl, -CON(C1-C8alkyl)2, -N(C1-C8alkyl)CONH(C1- C8alkyl), -N(C1-C8alkyl)CON(C1-C8alkyl)2, -NHCONH(C1-C8alkyl), -NHCON(C1-C8alkyl)2,-NHCONH2, -N(C1-C8alkyl)SO2NH(C1-C8alkyl), -N(C1-C8alkyl)SO2N(C1-C8alkyl)2, - NHSO2NH(C1-C8alkyl), -NHSO2N(C1-C8alkyl)2, or -NHSO2NH2; and R1cand R1dare each independently selected from the group consisting of H, deuterium, optionally substituted C1-4alkyl, C3-8cyclcoalkyl, C3-8heterocyclcoalkyl, aryl, and heteroaryl.

[0249] In other embodiments, q = 3 and R1is a chemical moiety represented by the formula: - A1-A2-A3-, wherein each of A1-3is independently selected from the group consisting of O, S, SO, SO2, NR1c, SO2NR1c, SONR1c, SO(=NR1c), SO(=NR1c)NR1d, CONR1c, NR1cCONR1d, NR1cC(O)O, NR1cSO2NR1d, CO, CR1a=CR1b, C=C, SiR1aR1b, P(O)R1a, P(O)OR1a, (CR1aR1b)1-4, -(CR1aR1b)1-4O(CR1aR1b)1-4, -(CR1aR1b)1-4S(CR1aR1b)1-4, -(CR1aR1b)1-4NR(CR1aR1b)1-4, optionally substituted 3-11 membered cycloalkyl, 3-11 membered heterocyclyl, aryl, and heteroaryl; wherein R1aand R1bare each independently selected from the group consisting of -H, deuterium, -halo, -C1-C8alkyl, -O-C1-C8alkyl, -C1-C6haloalkyl , -S-C1-C8alkyl,-NHC1- C8alkyl, -N(C1-C8alkyl)2, 3-11 membered cycloalkyl, aryl, heteroaryl, 3-11 membered heterocyclyl, -O-(3-11 membered cycloalkyl), -S-(3-11 membered cycloalkyl), NH-(3-11 membered cycloalkyl), N(3-11 membered cycloalkyl)2, N-(3-11 membered cycloalkyl)(C1- C8alkyl), -OH, -NH2, -SH, -SO2C1-C8alkyl, SO(NH)C1-C8alkyl , P(O)(OC1-C8alkyl)(C1- C8alkyl), -P(O)(OC1-C8alkyl)2, -C=C-C1-C8alkyl, -C=CH, -CH=CH(C1-C8alkyl), -C(C1- C8alkyl)=CH(C1-C8alkyl), -C(C1-C8alkyl)=C(C1-C8alkyl)2, -Si(OH)3, -Si(C1-C8alkyl)3, - Si(OH)(C1-C8alkyl)2, -C(O)C1-C8alkyl, -CO2H, -CN, -NO2, -SF5, -SO2NHC1-C8alkyl, - SO2N(C1-C8alkyl)2, -SO(NH)NHC1-C8alkyl, -SO(NH)N(C1-C8alkyl)2, -SONHC1-C8alkyl, - SON(C1-C8alkyl)2, -CONHC1-C8alkyl, -CON(C1-C8alkyl)2, -N(C1-C8alkyl)CONH(C1- C8alkyl), -N(C1-C8alkyl)CON(C1-C8alkyl)2, -NHCONH(C1-C8alkyl), -NHCON(C1-C8alkyl)2, -NHC0NH2, -N(C1-C8alkyl)SO2NH(C1-C8alkyl), -N(C1-C8alkyl)SO2N(C1-C8alkyl)2, - NHSO2NH(C1-C8alkyl), -NHSO2N(C1-C8alkyl)2, and -NHSO2NH2; and R1cand R1dare each independently selected from the group consisting of H, deuterium, optionally substituted C1-4alkyl, C3-8cyclcoalkyl, C3-8heterocyclcoalkyl, aryl, and heteroaryl.

[0250] In other embodiments, q = 2 and R1is a chemical moiety represented by the formula: -A1-A2-, wherein each of A1-2is independently selected from the group consisting of O, S, SO, SO2, NR1c, SO2NR1c, SONR1c, SO(=NR1c), SO(=NR1c)NR1d, CONR1c, NR1cCONR1d, NR1cC(O)O, NR1cSO2NR1d, CO, CR1a=CR1b, C=C, SiR1aR1b, P(O)R1a, P(O)OR1a, (CR1aR1b)1-4, -(CR1aR1b)1-4O(CR1aR1b)1-4, -(CR1aR1b)1-4S(CR1aR1b)1-4, -(CR1aR1b)1-4NR(CR1aR1b)1-4, optionally substituted 3-11 membered cycloalkyl, 3-11 membered heterocyclyl, aryl, and heteroaryl; wherein R1aand R1bare each independently selected from the group consisting of-H, deuterium, -halo, -C1-C8alkyl, -O-C1-C8alkyl, -C1-Cehaloalkyl , -S-C1-C8alkyl,-NHC1- C8alkyl, -N(C1-C8alkyl)2, 3-11 membered cycloalkyl, aryl, heteroaryl, 3-11 membered heterocyclyl, -O-(3-11 membered cycloalkyl), -S-(3-11 membered cycloalkyl), NH-(3-11 membered cycloalkyl), N(3-11 membered cycloalkyl)2, N-(3-11 membered cycloalkyl)(C1- C8alkyl), -OH, -NH2, -SH, -SO2C1-C8alkyl, SO(NH)C1-C8alkyl , P(O)(OC1-C8alkyl)(C1- C8alkyl), -P(O)(OC1-C8alkyl)2, -C=C-C1-C8alkyl, -C=CH, -CH=CH(C1-C8alkyl), -C(C1- C8alkyl)=CH(C1-C8alkyl), -C(C1-C8alkyl)=C(C1-C8alkyl)2, -Si(OH)3, -Si(C1-C8alkyl)3, - Si(OH)(C1-C8alkyl)2, -C(O)C1-C8alkyl, -CO2H, -CN, -NO2, -SF5, -SO2NHC1-C8alkyl, - SO2N(C1-C8alkyl)2, -SO(NH)NHC1-C8alkyl, -SO(NH)N(C1-C8alkyl)2, -SONHC1-C8alkyl, - SON(C1-C8alkyl)2, -CONHC1-C8alkyl, -CON(C1-C8alkyl)2, -N(C1-C8alkyl)CONH(C1- C8alkyl), -N(C1-C8alkyl)CON(C1-C8alkyl)2, -NHCONH(C1-C8alkyl), -NHCON(C1-C8alkyl)2, -NHCONH2, -N(C1-C8alkyl)SO2NH(C1-C8alkyl), -N(C1-C8alkyl)SO2N(C1-C8alkyl)2, - NHSO2NH(C1-C8alkyl), -NHSO2N(C1-C8alkyl)2, and -NHSO2NH2; and R1cand R1dare each independently selected from the group consisting of H, deuterium, optionally substituted C1-4alkyl, C3-8cyclcoalkyl, C3-8heterocyclcoalkyl, aryl, and heteroaryl.

[0251] In other embodiments, q = 1 and R1is a chemical moiety represented by the formula: -A1, wherein A1is selected from the group consisting of O, S, SO, SO2, NR1c, SO2NR1c, SONR1c, SO(=NR1c), SO(=NR1c)NR1d, CONR1c, NR1cCONR1d, NR1cC(O)O, NR1cSO2NR1d, CO, CR1a=CR1b, C=C, SiR1aR1b, P(O)R1a, P(O)OR1a, (CR1aR1b)1-4, -(CR1aR1b)1-4O(CR1aR1b)1-4, -(CR1aR1b)1-4S(CR1aR1b)1-4, -(CR1aR1b)1-4NR(CR1aR1b)1-4, optionally substituted 3-11 membered cycloalkyl, 3-11 membered heterocyclyl, aryl, and heteroaryl; wherein R1aand R1bare each independently selected from the group consisting of -H, deuterium, -halo, -C1- C8alkyl, -O-C1-C8alkyl, -C1-C6haloalkyl , -S-C1-C8alkyl,-NHC1-C8alkyl, -N(C1-C8alkyl)2, 3- 11 membered cycloalkyl, aryl, heteroaryl, 3-11 membered heterocyclyl, -O-(3-11 membered cycloalkyl), -S-(3-11 membered cycloalkyl), NH-(3-11 membered cycloalkyl), N(3-11 membered cycloalkyl)2, N-(3-11 membered cycloalkyl)(C1-C8alkyl), -OH, -NH2, -SH, - SO2C1-C8alkyl, SO(NH)C1-C8alkyl , P(O)(OC1-C8alkyl)(C1-C8alkyl), -P(O)(OC1-C8alkyl)2, - C=C-C1-C8alkyl, -C=CH, -CH=CH(C1-C8alkyl), -C(C1-C8alkyl)=CH(C1-C8alkyl), -C(C1- C8alkyl)=C(C1-C8alkyl)2, -Si(OH)3, -Si(C1-C8alkyl)3, -Si(OH)(C1-C8alkyl)2, -C(O)C1-C8alkyl, -CO2H, -CN, -NO2, -SF5, -SO2NHC1-C8alkyl, -SO2N(C1-C8alkyl)2, -SO(NH)NHC1-C8alkyl, - SO(NH)N(C1-C8alkyl)2, -SONHC1-C8alkyl, -SON(C1-C8alkyl)2, -CONHC1-C8alkyl, - CON(C1-C8alkyl)2, -N(C1-C8alkyl)CONH(C1-C8alkyl), -N(C1-C8alkyl)CON(C1-C8alkyl)2, - NHCONH(C1-C8alkyl), -NHCON(C1-C8alkyl)2, -NHC0NH2, -N(C1-C8alkyl)SO2NH(C1- C8alkyl), -N(C1-C8alkyl)SO2N(C1-C8alkyl)2, -NHSO2NH(C1-C8alkyl), -NHSO2N(CI-C8alkyl)2, and -NHSO2NH2; and R1cand R1dare each independently selected from the group consisting of H, deuterium, optionally substituted C1-4alkyl, C3-8cyclcoalkyl, C3-8hetero- cyclcoalkyl, aryl, and heteroaryl.

[0252] In some embodiments, R1is a covalent bond, 3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups, 3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups, -(CR1aR1b)1-5, -(CR1a=CR1b)-, -(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A-(CR1aR1b)1-5- wherein A is O, S, or NR1c, - (CR1aR1b)1-5-A-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(CR1a=CR1b)- (CR1aR1b)1-5-, -(CR1aR1b)1-5-( CR1a=CR1b)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, - (CR1aR1b)1-5-(C=C)-(CR1aR1b)1-5-, -(CR1aR1b)1-5-(C=C)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, -(C=C)-(CR1aR1b)1-5-A-(CR1aR1b)1-5- wherein A is O, S, or NR1c, -(C=C)-(CR1aR1b)1-5, -(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-, -(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-, -(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-, -(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups) -(CR1aR1b)1-5-, -(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-A-, -(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-A-, -(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5, -(CR1aR1b)1-5- (3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A- (3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5, -(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, - (CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)- wherein A is O, S, or NR1c, - (CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein each A is independently O, S, or NR1c, -(CR1aR1b)1-5-A-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein each A is independently O, S, or NR1c, -(CR1aR1b)1-5-A-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A-(CR1aR1b)1-5-A-(CR1aR1b)1-5-A-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A-(CO) wherein A is O, S, or NR1c, -(CR1aR1b)1-5-( CR1a=CR1b)-(CR1aR1b)1-5-A-(CO)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(C=C)- (CR1aR1b)1-5-A-(CO)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A-(CO)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A-(CO)-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A-(CO)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A-(CO)-(3-l l membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A-(3- 11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-A-(CO)- wherein each A is independently O, S, or NR1c, -(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-CO-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, - (CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A-(CO)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A-(CO)- wherein A is O, S, or NR1c, -(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-, or -(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-

[0253] In some embodiments, R1is -CR1a=CR1b-, such as, for example, -CH=CH-. In some embodiments, R1is -(CR1aR1b)1-5, for example -(CH2)1-5-, -CH2-, -CH2CH2CH2- and the like. In some embodiments, R1is -(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, such as for example, -(CH2)1-5-O-, -(CH2)1-5-S-, -(CH2)1-5-NH-, or -(CH2)0-2-(C(CH3)2)-(CH2)0-2-O-. In other embodiments, R1is -(CR1aR1b)1-5-A-(CR1aR1b)1-5- wherein A is O, S, or NR1c, such as, for example, -(CH2)1-5-O-(CH2)1-5-, -(CH2)1-5-S-(CH2)1-5-, -(CH2)1-5-NH-(CH2)1-5-. In some embodiments, R1is -(C=C)-(CR1aR1b)1-5, such as, for example, -(C=C)-(CH2)2-, and the like. In some embodiments, R1is -(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-, such as, for example, -CH2-cyclobutyl-. In some embodiments, R1is -(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5, such as, for example, -CH2-cyclobutyl-CH2- and the like. In some embodiments, R1is — (CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5, such as, for example, -CH2-azetidinyl-CH2-. In some embodiments, R1is -(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-, such as, for example, -CH2- azetidinyl-. In some embodiments, R1is -(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups) -(CR1aR1b)1-5-, such as, for example, -azetidinyl-CH2-, - pyrolidnyl-CH2-, -piperidinyl-CH2-, and the like. In some embodiments, R1is -(CR1aR1b)1-5- (3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)- (CR1aR1b)1-5-A- wherein A is O, S, or NR1c, such as, for example, -CH2-cyclopropyl-CH2-O-, and the like. In some embodiments, R1is -(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, such as, for example, -CH2-piperidinyl-CH2CH2-O-, and the like. In some embodiments, R1is -(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0- 6 R1aand / or R1bgroups)-A- wherein A is O, S, or NR1c, such as, for example, -CH2- azetidinyl-O-, and the like. In some embodiments, R1is -(CR1aR1b)1-5-A-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)- wherein A is O, S, or NR1c, such as, for example, -CH2-O-azetidinyl-, -CH2-NH-azetidinyl-, and the like. In other embodiments, R1is -(CR1aR1b)1-5-A-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)- wherein A is O, S, or NR1c, such as -CH2-O-cyclobutylene-, - CH2-NH-cyclobutylene-, and the like. In some embodiments, R1is -(CR1aR1b)1-5-A- (CR1aR1b)1-5-A- wherein A is O, S, or NR1c, such as, for example, -CH2-O-CH2CH2-O-.

[0254] In some aspects, the Y in the degrader compound of Formula IA is CRhwherein Rhis H or C1-3alkyl, and the degrader compound of Formula IA has Formula IA-1 :wherein Rc1, Rd1, Re3, W, Z, B, n, and R1are as described above for Formula IA.

[0255] In some embodiments, n in Formula IA-1 is 1.

[0256] In some embodiments of the degrader compound of Formula IA-1, at least one W is optionally substituted -CH2-. In some embodiments of the degrader compound of Formula IA-1, at least one W is -CH2- or substituted -CH2- wherein the substituents are alkyl, alkoxy, alkylamino. In some embodiments of the degrader compound of Formula IA-1, at least one W is -CH2-. In some embodiments of the degrader compound of Formula IA-1, one W is -C(O)-. In some embodiments of the degrader compound of Formula IA-1, one W is -S(O)-. In some embodiments of the degrader compound of Formula IA-1, one W is -S(O)2-.

[0257] In some embodiments, B in Formula IA-1 is an optionally substituted 5-7 membered cycloalkyl ring. In some embodiments, B in Formula IA-1 is an optionally substituted 5-7 membered cycloalkyl ring wherein the optional substituents are hydroxy, halogen, alkoxy, alkyl, haloalkyl, amino, alkylamino, or cyano. In other embodiments, B in Formula IA-1 is an optionally substituted 5-7 membered heterocyclic ring. In some embodiments, B in Formula IA-1 is an optionally substituted 5-7 membered heterocyclic ring wherein the optional substituents are hydroxy, halogen, alkoxy, alkyl, haloalkyl, amino, alkylamino, cyano.

[0258] In other aspects, the Y in the degrader compound of Formula IA is N, and Z is CRhwherein Rhis H or C1-3alkyl, and the degrader compound of Formula IA has Formula IA-2:wherein Rc1, Rd1, Re3, W, B, n, and R1are as described above for Formula IA.

[0259] In some embodiments, n in Formula IA-2 is 1.

[0260] In some embodiments of the degrader compound of Formula IA-2, at least one W is - CH2- or substituted -CH2-. In some embodiments of the degrader compound of Formula IA-2, at least one W is -CH2- or substituted -CH2- wherein the substituents are alkyl, alkoxy, alkylamino. In some embodiments of the degrader compound of Formula IA-2, at least one W is -CH2-. In some embodiments of the degrader compound of Formula IA-2, one W is - C(O)-. In some embodiments of the degrader compound of Formula IA-2, one W is -S(O)-. In some embodiments of the degrader compound of Formula IA-2, one W is -S(O)2-.

[0261] In some embodiments, B in Formula IA-2 is an optionally substituted 5-7 membered heterocyclic ring. In some embodiments, B in Formula IA-2 is an optionally substituted 5-7 membered heterocyclic ring wherein the optional substituents are hydroxy, halogen, alkoxy, alkyl, haloalkyl, amino, alkylamino, cyano. In other embodiments, B in Formula IA-2 is an optionally substituted 5-7 membered heterocyclic ring. In some embodiments, B in Formula IA-2 is an optionally substituted 5-7 membered heterocyclic ring wherein the optional substituents are hydroxy, halogen, alkoxy, alkyl, haloalkyl, amino, alkylamino, or cyano.

[0262] In some aspects, the degrader compound of Formula IA is a degrader compound of Formula IA-3:wherein m = 1 to 3;X is optionally substituted -CH2-, or NH; or, if R1is attached to X, then X is -CH- or N;Q is optionally substituted -CH2-, optionally substituted -(CH2)2-, -C(O)-, optionally substituted -CH2C(O)-, -S(O)-, -S(O)2-, optionally substituted -CH2S(O)2-, or optionally substituted -CH2S(O)-; and wherein Rc1, Rd1, Re3, W, Z, B, n, and R1are as described above for Formula IA.

[0263] In some embodiments of the degrader compound of Formula IA-3, n = 1. In other embodiments of the degrader compound of Formula IA-3, n = 2. In other embodiments of the degrader compound of Formula IA-3, n = 3.

[0264] In some embodiments of the degrader compound of Formula IA-3, X is -CH-. In other embodiments of the degrader compound of Formula IA-3, X is NH. In some of those embodiments of the degrader compound of Formula IA-3 wherein R1is attached to X, then X is CH. In other of those embodiments of the degrader compound of Formula IA-3 wherein R1is attached to X, then X is N.

[0265] In some embodiments of the degrader compound of Formula IA-3, Q is optionally substituted -CH2-. In some embodiments of the degrader compound of Formula IA-3, Q is optionally substituted -CH2- wherein the optional substituents are alkyl, alkoxy, or alkylamino. In some embodiments of the degrader compound of Formula IA-3, Q is optionally substituted -(CH2)2-. In some embodiments of the degrader compound of Formula IA-3, Q is optionally substituted -(CH2)2- wherein the optional substituents are alkyl, alkoxy, or alkylamino. In some embodiments of the degrader compound of Formula IA-3, Q is - C(O)-. In some embodiments of the degrader compound of Formula IA-3, Q is optionally substituted -CH2C(O)-. In some embodiments of the degrader compound of Formula IA-3, Q is -S(O)-. In some embodiments of the degrader compound of Formula IA-3, Q is -S(O)2-. In some embodiments of the degrader compound of Formula IA-3, Q is optionally substituted - CH2S(O)2-. In some embodiments of the degrader compound of Formula IA-3, Q is optionally substituted -CH2S(O)-.

[0266] In some aspects, the degrader compound of Formula IA is a degrader compound ofFormula IA-4:wherein Rk= H, deuterium, F, C1-3alkyl, C1-3haloalkyl, C1-4alkoxyl, substituted C1-3alkyl, substituted C1-3haloalkyl, or substituted C1-4alkoxyl; s = 0-7; m = 1-3; and wherein Rc1, Rd1, Re3, W, n, and R1are as described above for Formula IA.

[0267] In some embodiments of the degrader compound of Formula IA-4, n = 1. In other embodiments of the degrader compound of Formula IA-4, n = 2. In other embodiments of the degrader compound of Formula IA-4, n = 3.

[0268] In some embodiments of the degrader compound of Formula IA-4, m = 1. In other embodiments of the degrader compound of Formula IA-4, m = 2. In other embodiments of the degrader compound of Formula IA-4, m = 3.

[0269] In some embodiments of the degrader compound of Formula IA-4, s = 0. In some embodiments of the degrader compound of Formula IA-4, s = 1. In other embodiments of the degrader compound of Formula IA-4, s = 2. In other embodiments of the degrader compound of Formula IA-4, s = 3.

[0270] In some embodiments of the degrader compound of Formula IA-4, Rk= H. In some embodiments of the degrader compound of Formula IA-4, Rk= deuterium. In some embodiments of the degrader compound of Formula IA-4, Rk= F. In some embodiments of the degrader compound of Formula IA-4, Rk= C1-3alkyl, for example, C1alkyl, C2alkyl, C3alkyl, -CH3, - CH2CH3, and the like. In some embodiments of the degrader compound of Formula IA-4, Rk= C1-3haloalkyl, for example, C1haloalkyl, C2haloalkyl, C3haloalkyl, - CF3, - CH2CF3, and the like. In some embodiments of the degrader compound of Formula IA- 4, Rk= C1-4alkoxyl, for example, C1alkoxyl, C2alkoxyl, C3alkoxyl, -OCH3, -OCH2CH3, and the like. In some embodiments of the degrader compound of Formula IA-4, Rk= substituted C1-3alkyl, for example, substituted C1alkyl, substituted C2alkyl, substituted C3alkyl, and the like. In some embodiments of the degrader compound of Formula IA-4, Rk= substituted C1-3haloalkyl, for example, substituted C1haloalkyl, substituted C2haloalkyl, substituted C3haloalkyl, and the like. In some embodiments of the degrader compound of Formula IA-4, Rk= substituted C1-4alkoxyl, for example, substituted C1alkoxyl, substituted C2alkoxyl, substituted C3alkoxyl, and the like.

[0271] In some aspects, the degrader compound of Formula IA is a degrader compound of Formula IA-5:wherein Rk= H, deuterium, F, C1-3alkyl, C1-3haloalkyl, or C1-4alkoxyl; m = 1-3; and s = 0-3, and wherein Rc1, Rd1, Re3, W, and R1are as described above for Formula IA.

[0272] In some embodiments of the degrader compound of Formula IA-5, m = 1. In other embodiments of the degrader compound of Formula IA-5, m = 2. In other embodiments of the degrader compound of Formula IA-5, m = 3.

[0273] In some embodiments of the degrader compound of Formula IA-5, s = 0. In some embodiments of the degrader compound of Formula IA-5, s = 1. In other embodiments of the degrader compound of Formula IA-5, s = 2. In other embodiments of the degrader compound of Formula IA-5, s = 3.

[0274] In some embodiments of the degrader compound of Formula IA-5, Rk= H. In some embodiments of the degrader compound of Formula IA-5, Rk= deuterium. In some embodiments of the degrader compound of Formula IA-5, Rk= F. In some embodiments of the degrader compound of Formula IA-5, Rk= C1-3alkyl, for example, C1alkyl, C2alkyl, C3alkyl, -CH3, - CH2CH3, and the like. In some embodiments of the degrader compound of Formula IA-5, Rk= C1-3haloalkyl, for example, C1haloalkyl, C2haloalkyl, C3haloalkyl, - CF3, - CH2CF3, and the like. In some embodiments of the degrader compound of Formula IA- 5, Rk= H. or C1-4alkoxyl, for example, C1alkoxyl, C2alkoxyl, C3alkoxyl, -OCH3, - OCH2CH3, and the like.

[0275] In some aspects, the degrader compound of Formula IA is a degrader compound of Formula IA-6, Formula IA-6a or Formula IA-6b:wherein Rk= H, deuterium, F, C1-3alkyl, C1-3haloalkyl, or C1-4alkoxyl; and s = 0-3, and wherein Rc1, Rd1, Re3, and R1are as described above for Formula IA.

[0276] In some embodiments, the degrader compound is a degrader compound of Formula IA-6. In some embodiments, the degrader compound is a degrader compound of Formula IA- 6a. In some embodiments, the degrader compound is a degrader compound of Formula IA- 6b.

[0277] In some embodiments of the degrader compound of Formula IA-6, IA-6a or IA-6b, s = 0. In some embodiments of the degrader compound of Formula IA-6, IA-6a or IA-6b, s = 1. In other embodiments of the degrader compound of Formula IA-6, IA-6a or IA-6b, s = 2. In other embodiments of the degrader compound of Formula IA-6, IA-6a or IA-6b, s = 3.

[0278] In some embodiments of the degrader compound of Formula IA-6, IA-6a or IA-6b, Rk= H. In some embodiments of the degrader compound of Formula IA-6, IA-6a or IA-6b, Rk= deuterium. In some embodiments of the degrader compound of Formula IA-6, IA-6a or IA- 6b, Rk= F. In some embodiments of the degrader compound of Formula IA-6, IA-6a or IA- 6b, Rk= C1-3alkyl, for example, C1alkyl, C2alkyl, C3alkyl, -CH3, - CH2CH3, and the like. In some embodiments of the degrader compound of Formula IA-6, IA-6a or IA-6b, Rk= C1-3haloalkyl, for example, C1haloalkyl, C2haloalkyl, C3haloalkyl, -CF3, - CH2CF3, and the like. In some embodiments of the degrader compound of Formula IA-6, IA-6a or IA-6b, Rk= H. or C1-4alkoxyl, for example, C1alkoxyl, C2alkoxyl, C3alkoxyl, -OCH3, -OCH2CH3, and the like.ULM

[0279] In some aspects, the ULM moiety in the degrader compounds of the disclosure is a small molecule E3 Ubiquitin Ligase binding moiety that binds a Von Hippel-Lindau E3 Ubiquitin Ligase (VHL) or a Cereblon E3 Ubiquitin Ligase (CRBN). Such ULM moieties that bind to VHL are known to those of skill in the art. Methods of determining whether a small molecule binds a Von Hippel-Lindau E3 Ubiquitin Ligase are known in the art. Such ULM moieties that bind to CRBN are known to those of skill in the art. Methods of determining whether a small molecule binds a Cereblon E3 Ubiquitin Ligase are known in the art, for example, see Lai A.C., Crews C.M. Nat Rev Drug Discov. 2017; 16(2): 101-114.Von Hippel-Lindau E3 Ubiquitin Ligase (VHL)

[0280] In some aspects, the ULM moiety in the degrader compounds of the disclosure is a small molecule E3 Ubiquitin Ligase binding moiety that binds a Von Hippel-Lindau E3 Ubiquitin Ligase (VHL). Such ULM moieties that bind to VHL are known to those of skill in the art. Methods of determining whether a small molecule binds a Von Hippel-Lindau E3 Ubiquitin Ligase are known in the art.

[0281] In some embodiments, the ULM is a previously described ULM. In some embodiments, the ULM is a ULM moiety described in U.S. Patent Application Publication No. 2019 / 0300521, the entirety of which is incorporated by reference herein. In other embodiments, the ULM is a ULM moiety described in U.S. Patent Application Publication No. 2019 / 0255066, the entirety of which is incorporated by reference herein. In other embodiments, the ULM is a ULM moiety described in WO 2019 / 084030, the entirety of which is incorporated by reference herein. In other embodiments, the ULM is a ULM moiety described in WO 2019 / 084026, the entirety of which is incorporated by reference herein.

[0282] In some embodiments, the ULM is a moiety having the Formula ULM-I-VHLwherein------- indicates the position of attachment of the ULM to R1;V is H or F;R3is optionally substituted phenyl, optionally substituted napthyl, or an optionally substituted 5-10 membered heteroaryl; one of R4or R5is H, deuterium, haloalkyl, optionally substituted alkyl, optionally substituted cycloalkyl, optionally substituted heterocycloalkyl, -CORdv, or CONRe1Re2; the other of R4or R5is H or deuterium; or R4and R5, together with the carbon atom to which they are both attached, form an optionally substituted 3-5 membered cycloalkyl, or heterocyclyl;W3is an optionally substituted aryl, optionally substituted heteroaryl, orR6and R7are independently H, deuterium, optionally substituted alkyl, optionally substituted cycloalkyl, or optionally substituted haloalkyl, or R6, R7, and the carbon atom to which they are attached form an optionally substituted cycloalkyl or optionally substituted heterocyclyl;R8is an optionally substituted heterocyclyl, optionally substituted heteroaryl, optionally substituted aryl, -C(O)NRavRbv, -NRavRbv,Ravis H or optionally substituted alkyl;Rbvis H, -C(O)-* wherein * is a point of attachment to R1, optionally substituted alkyl, optionally substituted alkyl carbonyl, optionally substituted (cycloalkyl)alkylcarbonyl, optionally substituted aralkyl carbonyl, optionally substituted arylcarbonyl, optionally substituted (cycloalkyl)carbonyl, optionally substituted (heterocyclyl)carbonyl, or optionally substituted aralkyl; each Rcis independently H, halo, optionally substituted alkoxy, cyano, optionally substituted alkyl, haloalkyl, or haloalkoxy; each Rdvis independently H, optionally substituted alkyl or NRe1Re2; each Re1and Re2is independently H, deuterium, or optionally substituted alkyl, or Re1and Re2together with the nitrogen atom to which they are attached form a 4-7 membered heterocyclyl; and p is 0, 1, 2, 3, or 4.

[0283] In some embodiments of ULM-I-VHL, V is H. In other embodiments of ULM-I- VHL, V is F.

[0284] In some embodiments of ULM-I-VHL, R3is optionally substituted phenyl having the formula:whereinR9is H, deuterium, halo, -CN, -OH, -NO2, -NRe1Re2, -ORe1, -CONRe1Re2, -NRe1CORe2, - SO2NRe1Re2, -NRe1SO2Re2, optionally substituted alkyl, optionally substituted alkoxyl, optionally substituted haloalkyl, optionally substituted haloalkoxy; optionally substituted aryl; optionally substituted heteroaryl; optionally substituted cycloalkyl; or optionally substituted heterocyclyl;R10is H, deuterium, halo, CN, optionally substituted alkyl, optionally substituted haloalkyl, hydroxy, optionally substituted alkoxy, or optionally substituted haloalkoxy; and z is 0, 1, 2, 3, or 4.

[0285] In some embodiments wherein R3is optionally substituted phenyl, R10is -F or -OCH3. In some embodiments wherein R3is optionally substituted phenyl, R9is -CN. In some embodiments wherein R3is optionally substituted phenyl, R9is an optionally substituted heteroaryl. In some embodiments wherein R3is optionally substituted phenyl, R9is, each optionally substituted.

[0286] In other embodiments wherein R3is optionally substituted phenyl, R9is

[0287] In other embodiments wherein R3is optionally substituted phenyl, R9is

[0288] In other embodiments, R3is

[0289] In some embodiments wherein R3is optionally substituted phenyl, R10is hydroxy, halogen, -NH(C1-C4alkyl), or C1-C6alkoxy, and z is 0, 1, 2, 3, or 4.

[0290] In some embodiments of ULM-I-VHL, one of R4or R5is H, and the other of R4or R5is H or optionally substituted alkyl. In other embodiments of ULM-I-VHL, one of R4or R5isH, and the other of R4or R5is optionally substituted C1-C6alkyl. In other embodiments of ULM-I-VHL, one of R4or R5is H, and the other of R4or R5is C1-C6alkyl. In other embodiments of ULM-I-VHL, one of R4or R5is H, and the other of R4or R5is -CH3. In other embodiments of ULM-I-VHL, one of R4or R5is H, and the other of R4or R5is - CH2OH. In other embodiments of ULM-I-VHL, both R4and R5are H.

[0291] In some embodiments of ULM-I-VHL, W3is

[0292] In some embodiments of ULM-I-VHL, R6is H. In some embodiments of ULM-I- VHL, R7is H, or optionally substituted alkyl. In some embodiments of ULM-I-VHL, R7is H. In some embodiments of ULM-I-VHL, R7is optionally substituted alkyl. In some embodiments of ULM-I-VHL, R7is optionally substituted C1-C6alkyl. In some embodiments of ULM-I-VHL, R7is C1-C6alkyl. In some embodiments of ULM-I-VHL, R7is C1-C6alk-OH, C1-C6alk-NH2, -C1-C6alk-CONH-*, or -C1-C6alk-NHCO-* wherein * is a point of attachment to R1. In some embodiments of ULM-I-VHL, R7is -t-butyl or -isopropyl. In some embodiments of ULM-I-VHL, R7is -t-butyl. In some embodiments of ULM-I-VHL, R7is - isopropyl.

[0293] In some embodiments of ULM-I-VHL, R8is NRavRbv. In some embodiments, Ravis H or optionally substituted alkyl. In some embodiments, Ravis H. In some embodiments, Rbvis H, optionally substituted alkyl, -C(O)-* wherein * is a point of attachment to R1, optionally substituted (cycloalkyl)carbonyl, or optionally substituted alkylcarbonyl. In some embodiments, Rbvis optionally substituted alkyl carbonyl. In some embodiments, Rbvis - C(O)-* wherein * is a point of attachment to R1. In some embodiments of ULM-I-VHL, R8is CONRavRbv.

[0294] In some embodiments of ULM-I-VHL, R8iswherein * is a point of attachment to R . In some embodiments ofULM-I-VHL, R8iswherein * is a point of attachment to R1. In someembodiments of ULM-I-VHL, R8iswherein * is a point of attachment to R1. In some embodiments of ULM-I-VHL, R8is

[0295] In some embodiments, R8is -NH-* wherein * is a point of attachment to R1. In some embodiments of ULM-I-VHL, R8is optionally substituted heteroaryl.

[0296] In some embodiments of ULM-I-VHL, R8iswherein each Rcis independently halo, optionally substituted alkoxy, cyano, optionally substituted alkyl, haloalkyl, or haloalkoxy, and p is 0, 1, or 2.

[0297] In some embodiments, R8iswherein each Rcis independently halo, optionally substituted alkoxy, cyano, optionally substituted alkyl, haloalkyl, or haloalkoxy, and p is 0, 1, or 2.

[0298] In some embodiments, R8is wherein * is a point of attachment to R1. Insome embodiments, R is

[0299] In some embodiments, ULM-I-VHL is a compound of formula:* is a point of attachment of the ULM to R1.

[0300] In some embodiments of ULM-IA- VHL, ULM-IB-VHL, ULM-IC-VHL, or ULM-ID-VHL, R9is optionally substituted and R10is H,deuterium, hydroxy, halogen, aminoC1-4alkyl, or C1-4alkyloxy.

[0301] In some embodiments, the ULM is a moiety having the Formula ULM-I-VHL-1 :wherein the dashed line ( ---- ) indicates the position of attachment of ULM-I-VHL-1 to R1;R15is hydrogen or -PO3H2; and all of the other variables have the same scope as set forth above with respect to ULM-I-VHL.

[0302] In some embodiments, R15in ULM-I-VHL-1 is hydrogen. In other embodiments, R15in ULM-I-VHL-1 is -PO3H2.

[0303] In some embodiments, the ULM is a moiety having the Formula ULM-II-VHLwherein------- indicates the position of attachment of the ULM to R1;R14is C1-C6alkyl, such as, for example, -CH3, -CH2CH3, -CH(CH3)2, and the like; and all of the other variables have the same scope as set forth above with respect to ULM-I-VHL.

[0304] In some embodiments, R14in ULM-II-VHL is -CH3. In other embodiments, R14in ULM-II-VHL is -CH(CH3)2.

[0305] In some aspects, the degrader compounds of Formula I are those having the formula IA-7-VHL or IA-8-VHL:wherein V is H or F;W is optionally substituted -CH2-, -C(O)-, -S(O)-, or -S(O)2-; wherein when n = 2 or 3, only one W may be -C(O)-, -S(O)-, or -S(O)2-; n = 0-3; m = 1-3;Rk= H, deuterium, F, C1-3alkyl, C1-3haloalkyl, or C1-4alkoxyl;Rc1and Rd1are independently H, deuterium, Halo, C1-3alkyl, C1-3haloalkyl, or C1-4alkoxyl;Re3is H, -C(O)Rf, -CH2-O-P(O)(ORg)2, or -P(O)(ORg)2; wherein Rfand Rgare independently H, C1-4alkyl, C1-4substituted alkyl, C3-8cyclcoalkyl, C3-8substituted cyclcoalkyl, C3-8heterocyclcoalkyl, or C3-8substituted heterocyclcoalkyl;R1is a covalent bond, 3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups, 3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups, -(CR1aR1b)1-5, -(CR1a=CR1b)-, -(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A-(CR1aR1b)1-5- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A- (CR1aR1b)1-5-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(CR1a=CR1b)-(CR1aR1b)1-5-, -(CR1aR1b)1-5-( CR1a=CR1b)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5- (C=C)-(CR1aR1b)1-5-, -(CR1aR1b)1-5-(C=C)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, -(C=C)-(CR1aR1b)1-5-A-(CR1aR1b)1-5- wherein A is O, S, or NR1c, -(C=C)-(CR1aR1b)1-5, -(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-, -(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-, -(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-, -(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups) -(CR1aR1b)1-5-, -(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-A-, - (CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-A-, -(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5, -(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5, -(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-A- wherein A is O, S, or NR1c, - (CR1aR1b)1-5-A-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A-wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein each A is independently O, S, or NR1c, -(CR1aR1b)1-5-A-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein each A is independently O, S, or NR1c, -(CR1aR1b)1-5-A-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A-(CR1aR1b)1-5-A- (CR1aR1b)1-5-A-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A-(CO) wherein A is O, S, or NR1c, -(CR1aR1b)1-5-( CR1a=CR1b)-(CR1aR1b)1-5-A-(CO)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(C=C)-(CR1aR1b)1-5-A-(CO)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A-(CO)- wherein A Is O, S, or NR1c, - (CR1aR1b)1-5-A-(CO)-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- (CO)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A-(CO)-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A-(3-11 membered cycloalkyl optionally substituted with 0- 6 R1aand / or R1bgroups)-A-(CO)- wherein each A is independently O, S, or NR1c, -(3- 11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-CO- (CR1aR1b)1-5-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A-(CO)- wherein A is O, S, or NR1c, -(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c; -(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)- (CR1aR1b)1-5-A-(CO)- wherein A is O, S, or NR1c, -(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-, or— (3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)- (CR1aR1b)1-5-;R4is H, optionally substituted alkyl, optionally substituted C1-C6alkyl, or -CH3;R7is optionally substituted alkyl, preferably optionally substituted C1-C6alkyl, and more preferably C1-C6alkyl; andR9is H, deuterium, halo, -CN, -OH, -NO2, -NRe1Re2, -ORe1, -CONRe1Re2, - NRe1CORe2, -SO2NRe1Re2, -NRe1SO2Re2, optionally substituted alkyl, optionallysubstituted alkoxyl, optionally substituted haloalkyl, optionally substituted haloalkoxy; optionally substituted aryl; optionally substituted heteroaryl; optionally substituted cycloalkyl; or optionally substituted heterocyclyl;R1a, R1b, R1c, and R1eare each independently, -H, deuterium, -halo, -C1-C8alkyl, -C1- C6haloalkyl, -O-C1-C8alkyl, -S-C1-C8alkyl, -NHC1-C8alkyl, -N(C1-C8alkyl)2, 3-11 membered cycloalkyl, aryl, heteroaryl, 3-11 membered heterocyclyl, -O-(3-11 membered cycloalkyl), -S-(3-11 membered cycloalkyl), NH-(3-11 membered cycloalkyl), N(3-11 membered cycloalkyl)2, N-(3-11 membered cycloalkyl)(C1- C8alkyl), -OH, -NH2, -SH, -SO2C1-C8alkyl, SO(NH)C1-C8alkyl, P(O)(OC1- C8alkyl)(C1-C8alkyl), -P(O)(OC1-C8alkyl)2, -C=C-C1-C8alkyl, -C=CH, -CH=CH(C1- C8alkyl), -C(C1-C8alkyl)=CH(C1-C8alkyl), -C(C1-C8alkyl)=C(C1-C8alkyl)2, -Si(OH)3, -Si(C1-C8alkyl)3, -Si(OH)(C1-C8alkyl)2, -C(O)C1-C8alkyl, -CO2H, -CN, -CF3, -CHF2, -CH2F, -NO2, -SF5, -SO2NHC1-C8alkyl, -SO2N(C1-C8alkyl)2, -SO(NH)NHC1-C8alkyl, -SO(NH)N(C1-C8alkyl)2, -SONHC1-C8alkyl, -SON(C1-C8alkyl)2, -CONHC1-C8alkyl, -CON(C1-C8alkyl)2, -N(C1-C8alkyl)CONH(C1-C8alkyl), -N(C1-C8alkyl)CON(C1- C8alkyl)2, -NHCONH(C1-C8alkyl), -NHCON(C1-C8alkyl)2, -NHCONH2, -N(C1- C8alkyl)SO2NH(C1-C8alkyl), -N(C1-C8alkyl)SO2N(C1-C8alkyl)2, -NHSO2NH(CI- C8alkyl), -NHSO2N(C1-C8alkyl)2, or -NHSO2NH2;or where the context permits, R1aor R1b, are linked to other groups, or to each other, to form a cycloalkyl and / or a heterocyclyl moiety, optionally substituted with 0-4 R1egroups; and each Re1and Re2is independently H, deuterium, or optionally substituted alkyl, or Re1and Re2together with the nitrogen atom to which they are attached form a 4-7 membered heterocyclyl.

[0306] In some aspects, the degrader compounds of Formula I are those having the formula IA-9-VHL or IA-10-VHL:wherein V is H or F;W is optionally substituted -CH2-, -C(O)-, -S(O)-, or -S(O)2-; wherein when n = 2 or 3, only one W may be -C(O)-, -S(O)-, or -S(O)2-; n = 0-3; m = 1-3;Rk= H, deuterium, F, C1-3alkyl, C1-3haloalkyl, or C1-4alkoxyl; s = 0-3;Rc1and Rd1are independently H, deuterium, Halo, C1-3alkyl, C1-3haloalkyl, or C1-4alkoxyl;Re3is H, -C(O)Rf, or -P(O)(ORg)2; wherein Rfand Rgare independently H, C1-4alkyl, C1-4substituted alkyl, C3-8cyclcoalkyl, C3-8substituted cyclcoalkyl, C3-8heterocyclcoalkyl, or C3-8substituted heterocyclcoalkyl;R1is a covalent bond, 3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups, 3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups, -(CR1aR1b)1-5, -(CR1a=CR1b)-, -(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A-(CR1aR1b)1-5- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A- (CR1aR1b)1-5-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(CR1a=CR1b)-(CR1aR1b)1-5-, -(CR1aR1b)1-5-( CR1a=CR1b)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5- (C=C)-(CR1aR1b)1-5-, -(CR1aR1b)1-5-(C=C)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, -(C=C)-(CR1aR1b)1-5-A-(CR1aR1b)1-5- wherein A is O, S, or NR1c, -(C=C)-(CR1aR1b)1-5, -(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-, -(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-, -(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-, -(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-, -(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-A-, - (CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-A-, -(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5, -(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5, -(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-A- wherein A is O, S, or NR1c, - (CR1aR1b)1-5-A-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein each A is independently O, S, or NR1c, -(CR1aR1b)1-5-A-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein each A is independently O, S, or NR1c, -(CR1aR1b)1-5-A-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A-(CR1aR1b)1-5-A- (CR1aR1b)1-5-A-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A-(CO) wherein A is O, S, or NR1c, -(CR1aR1b)1-5-( CR1a=CR1b)-(CR1aR1b)1-5-A-(CO)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(C=C)-(CR1aR1b)1-5-A-(CO)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A-(CO)- wherein A is O, S, or NR1c, - (CR1aR1b)1-5-A-(CO)-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- (CO)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A-(CO)-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A-(3-11 membered cycloalkyl optionally substituted with 0- 6 R1aand / or R1bgroups)-A-(CO)- wherein each A is independently O, S, or NR1c, -(3- 11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-CO- (CR1aR1b)1-5-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(3-11 membered cycloalkyloptionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A-(CO)- wherein A is O, S, orNR1c, -(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A-(CO)- wherein A is O, S, or NR1c, -(3- 11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)- (CR1aR1b)1-5-, or -(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-; or R1is -(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CO)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c; -(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CO)-A-(CR1aR1b)1-5- wherein A is O, S, orNR1c; -A-(3-l l membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein each A is independently O, S, or NR1c; -(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein A is O, S, orNR1c; -(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c; -(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-A- (CR1aR1b)1-5-A- wherein each A is independently O, S, or NR1c; -(heteroaryl optionally substituted with 0-4 R1aand / or R1bgroups)-A-(CR1aR1b)1-5- wherein A is O, S, or NR1c; -(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c; -(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CO)-(CR1aR1b)1-5- A- wherein A is O, S, or NR1c; -(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CO)-A-(CR1aR1b)1-5- wherein A is O, S, or NR1c; or - (CO)-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c;R4is H, optionally substituted alkyl, optionally substituted C1-C6alkyl, or -CH3;R7is optionally substituted alkyl, preferably optionally substituted C1-C6alkyl, and more preferably C1-C6alkyl; andR9is H, deuterium, halo, -CN, -OH, -NO2, -NRe1Re2, -ORe1, -CONRe1Re2, - NRe1CORe2, -SO2NRe1Re2, -NRe1SO2Re2, optionally substituted alkyl, optionally substituted alkoxyl, optionally substituted haloalkyl, optionally substituted haloalkoxy; optionally substituted aryl; optionally substituted heteroaryl; optionally substituted cycloalkyl; or optionally substituted heterocyclyl;R1a, R1b, R1c, and R1eare each independently, -H, deuterium, -halo, -C1-C8alkyl, -C1- C6haloalkyl, -O-C1-C8alkyl, -S-C1-C8alkyl, -NHC1-C8alkyl, -N(C1-C8alkyl)2, 3-11 membered cycloalkyl, aryl, heteroaryl, 3-11 membered heterocyclyl, -O-(3-11 membered cycloalkyl), -S-(3-11 membered cycloalkyl), NH-(3-11 membered cycloalkyl), N(3-11 membered cycloalkyl)2, N-(3-11 membered cycloalkyl)(C1- C8alkyl), -OH, -NH2, -SH, -SO2C1-C8alkyl, SO(NH)C1-C8alkyl, P(O)(OC1- C8alkyl)(C1-C8alkyl), -P(O)(OC1-C8alkyl)2, -C=C-C1-C8alkyl, -C=CH, -CH=CH(C1- C8alkyl), -C(C1-C8alkyl)=CH(C1-C8alkyl), -C(C1-C8alkyl)=C(C1-C8alkyl)2, -Si(OH)3, -Si(C1-C8alkyl)3, -Si(OH)(C1-C8alkyl)2, -C(O)C1-C8alkyl, -CO2H, -CN, -CF3, -CHF2, -CH2F, -NO2, -SF5, -SO2NHC1-C8alkyl, -SO2N(C1-C8alkyl)2, -SO(NH)NHC1-C8alkyl, -SO(NH)N(C1-C8alkyl)2, -SONHC1-C8alkyl, -SON(C1-C8alkyl)2, -CONHC1-C8alkyl, -CON(C1-C8alkyl)2, -N(C1-C8alkyl)CONH(C1-C8alkyl), -N(C1-C8alkyl)CON(C1- C8alkyl)2, -NHCONH(C1-C8alkyl), -NHCON(C1-C8alkyl)2, -NHCONH2, -N(C1- C8alkyl)SO2NH(C1-C8alkyl), -N(C1-C8alkyl)SO2N(C1-C8alkyl)2, -NHSO2NH(C1- C8alkyl), -NHSO2N(C1-C8alkyl)2, or -NHSO2NH2;or where the context permits, R1aor R1b, are linked to other groups, or to each other, to form a cycloalkyl and / or a heterocyclyl moiety, optionally substituted with 0-4 R1egroups; and each Re1and Re2is independently H, deuterium, or optionally substituted alkyl, or Re1and Re2together with the nitrogen atom to which they are attached form a 4-7 membered heterocyclyl.

[0307] In some embodiments of the degrader compound of Formula IA-9-VHL or IA-10- VHL, n = 1. In other embodiments of the degrader compound of Formula IA-9-VHL or IA- 10-VHL, n = 2. In other embodiments of the degrader compound of Formula IA-9-VHL or IA-10-VHL, n = 3.

[0308] In some embodiments of the degrader compound of Formula IA-7-VHL or IA-8- VHL, m = 1. In other embodiments of the degrader compound of Formula IA-7-VHL or IA- 8-VHL, m = 2. In other embodiments of the degrader compound of Formula IA-7-VHL or IA-8-VHL, m = 3.

[0309] In some embodiments of the degrader compound of Formula IA-9-VHL or IA-10- VHL, s = 0. In some embodiments of the degrader compound of Formula IA-9-VHL or IA- 10-VHL, s = 1. In other embodiments of the degrader compound of Formula IA-9-VHL or IA-10-VHL, s = 2. In other embodiments of the degrader compound of Formula IA-9-VHL or IA-10-VHL, p = 3.

[0310] In some embodiments of the degrader compound of Formula IA-9-VHL or IA-10- VHL, Rk= H. In some embodiments of the degrader compound of Formula IA-9-VHL or IA- 10-VHL, Rk= deuterium. In some embodiments of the degrader compound of Formula IA-9- VHL or IA-10-VHL, Rk= F. In some embodiments of the degrader compound of Formula IA- 9-VHL or IA-10-VHL, Rk= C1-3alkyl, for example, C1alkyl, C2alkyl, C3alkyl, -CH3, - CH2CH3, and the like. In some embodiments of the degrader compound of Formula IA-9- VHL or IA-10-VHL, Rk= C1-3haloalkyl, for example, C1haloalkyl, C2haloalkyl, C3haloalkyl, -CF3, - CH2CF3, and the like. In some embodiments of the degrader compound of Formula IA-9-VHL or IA-10-VHL, Rk= H. or C1-4alkoxyl, for example, C1alkoxyl, C2alkoxyl, C3alkoxyl, -OCH3, -OCH2CH3, and the like.

[0311] In some embodiments of the degrader compound of Formula IA-9-VHL or IA-10- VHL, Rc1and Rd1are each H. In some embodiments of the degrader compound of Formula IA-9-VHL or IA-10-VHL, Re3is H. In some embodiments of the degrader compound of Formula IA-9-VHL or IA-10-VHL, Rc1, Rd1, and Re3are each H.

[0312] In some aspects, the degrader compounds of Formula I are degrader compounds ofFormula IA-9a-VHL or / A-10a-VHL:wherein X is N or CH, and the other variables are as set forth above with respect to FormulaIA-9-VHL and IA-10-VHL.

[0313] In some aspects, the degrader compounds of Formula I are those having the formulaIA-11-VHL or IA-12-VHL:whereinW is -CH2- or -CH(CH3)-X is N or CH;R1is a covalent bond;-3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups;3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups;-(CR1aR1b)1-5;-(CR1a=CR1b)-;-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c;-(CR1aR1b)1-5-A-(CR1aR1b)1-5- wherein A is O, S, or NR1c;-(CR1aR1b)1-5-A-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c;-(CR1aR1b)1-5-(CR1a=CR1b)-(CR1aR1b)1-5-;-(CR1aR1b)1-5-( CR1a=CR1b)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c;-(CR1aR1b)1-5-(C=C)-(CR1aR1b)1-5-;-(CR1aR1b)1-5-(C=C)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c;-(C=C)-(CR1aR1b)1-5-A-(CR1aR1b)1-5- wherein A is O, S, or NR1c;-(C=C)-(CR1aR1b)1-5;-(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-;-(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-;-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)- (CR1aR1b)1-5-;-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)- (CR1aR1b)1-5-A- wherein A is O, S, or NR1c;-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)- (CR1aR1b)1-5-A- wherein A is O, S, or NR1c;-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)— (CR1aR1b)1-5-;-(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)- A- wherein A is O, S, or NR1c;-(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)- A- wherein A is O, S, or NR1c;-(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5;-(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)- A- wherein A is O, S, or NR1c;-(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c;-(CR1aR1b)1-5-A-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)- wherein A is O, S, or NR1c;-(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5;-(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c;-(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)- A- wherein A is O, S, or NR1c;-(CR1aR1b)1-5-A-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)- wherein A is O, S, or NR1c;-(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c;-(CR1aR1b)1-5-A-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)- wherein A is O, S, or NR1c;-(CR1aR1b)1-5-A-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein each A is independently O, S, or NR1c; -(CR1aR1b)1-5-A-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein each A is independently O, S, or NR1c; -(CR1aR1b)1-5-A-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c;-(CR1aR1b)1-5-A-(CR1aR1b)1-5-A-(CR1aR1b)1-5-A-(CR1aR1b)1-5-A- wherein each A is independently O, S, or NR1c;-(CR1aR1b)1-5-A-(CO) wherein A is O, S, or NR1c;-(CR1aR1b)1-5-( CR1a=CR1b)-(CR1aR1b)1-5-A-(CO)- wherein A is O, S, or NR1c;-(CR1aR1b)1-5-(C=C)-(CR1aR1b)1-5-A-(CO)- wherein A is O, S, or NR1c;-(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A-(CO)- wherein A is O, S, or NR1c;-(CR1aR1b)1-5-A-(CO)-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)- wherein A is O, S, or NR1c;-(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A-(CO)- wherein A is O, S, or NR1c;-(CR1aR1b)1-5-A-(CO)-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)- wherein A is O, S, or NR1c;-(CR1aR1b)1-5-A-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)- A-(CO)- wherein each A is independently O, S, or NR1c;-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)- CO-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c;-(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A-(CO)- wherein A is O, S, or NR1c;-(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A-(CO)- wherein A is O, S, or NR1c;-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)- (CR1aR1b)1-5-;-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)- (CR1aR1b)1-5-;-A-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein each A is independently O, S, or NR1c;-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)- (CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / orR1bgroups)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c;-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)- (3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)- (CR1aR1b)1-5-A- wherein A is O, S, or NR1c;-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)- A-(CR1aR1b)1-5-A- wherein each A is independently O, S, or NR1c;-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)- (CO)-A-(CR1aR1b)1-5- wherein A is O, S, or NR1c;-(heteroaryl optionally substituted with 0-4 R1aand / or R1bgroups)-A-(CR1aR1b)1-5- wherein A is O, S, or NR1c;-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)- (CO)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c;-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)- (CO)-A-(CR1aR1b)1-5- wherein A is O, S, or NR1c; or-(CO)-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c;R4is H, -CH3, or -CH2OH;R7is C1-C6alkyl, preferably -C(CH3)3 or -CH(CH3)2; andR9is -CN or optionally substituted heteroaryl, preferably,R1a, R1b, R1c, and R1eare each independently, -H, deuterium, -halo, -C1-C8alkyl, -C1- C6haloalkyl, -O-C1-C8alkyl, -S-C1-C8alkyl, -NHC1-C8alkyl, -N(C1-C8alkyl)2, 3-11 membered cycloalkyl, aryl, heteroaryl, 3-11 membered heterocyclyl, -O-(3-11 membered cycloalkyl), - S-(3-11 membered cycloalkyl), NH-(3-11 membered cycloalkyl), N(3-11 membered cycloalkyl)2, N-(3-11 membered cycloalkyl)(C1-C8alkyl), -OH, -NH2, -SH, -SO2C1-C8alkyl, SO(NH)C1-C8alkyl, P(O)(OC1-C8alkyl)(C1-C8alkyl), -P(O)(OC1-C8alkyl)2, -C=C-C1-C8alkyl, -C=CH, -CH=CH(C1-C8alkyl), -C(C1-C8alkyl)=CH(C1-C8alkyl), -C(C1-C8alkyl)=C(C1- C8alkyl)2, -Si(OH)3, -Si(C1-C8alkyl)3, -Si(OH)(C1-C8alkyl)2, -C(O)C1-C8alkyl, -CO2H, -CN, - CF3, -CHF2, -CH2F, -NO2, -SF5, -SO2NHC1-C8alkyl, -SO2N(C1-C8alkyl)2, -SO(NH)NHC1- C8alkyl, -SO(NH)N(C1-C8alkyl)2, -SONHC1-C8alkyl, -SON(C1-C8alkyl)2, -CONHC1-C8alkyl, -CON(C1-C8alkyl)2, -N(C1-C8alkyl)CONH(C1-C8alkyl), -N(C1-C8alkyl)CON(C1-C8alkyl)2, - NHCONH(C1-C8alkyl), -NHCON(C1-C8alkyl)2, -NHC0NH2, -N(C1-C8alkyl)SO2NH(C1- C8alkyl), -N(C1-C8alkyl)SO2N(C1-C8alkyl)2, -NHSO2NH(C1-C8alkyl), -NHSO2N(C1-C8alkyl)2, or -NHSO2NH2; or where the context permits, R1aor R1b, are linked to other groups, or to each other, to form a cycloalkyl and / or a heterocyclyl moiety, optionally substituted with 0-4 R1egroups.

[0314] In some embodiments, W is -CH2-. In some embodiments, X is -N. In other embodiments, X is -CH. In some embodiments, R4is -CH3. In some embodiments, R7is ably -C(CH3)3 or -CH(CH3)2. In some embodiments, Rkis -CH3and s=l. In some embodiments, s=0. In some embodiments, R9is

[0315] In some embodiments of the degrader compound of formula I, such as formula IA-11- VHL or formula IA-12-VHL, R1is:-(CR1aR1b)1-5;-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c;-(CR1aR1b)1-5-A-(CR1aR1b)1-5- wherein A is O, S, or NR1c;-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)- (CO)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c;-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)- (CO)-A-(CR1aR1b)1-5- wherein A is O, S, or NR1c;-(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)- A- wherein A is O, S, or NR1c;-(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5;-(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c;-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)- (CR1aR1b)1-5-A- wherein A is O, S, or NR1c;-A-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein each A is independently O, S, or NR1c;-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)- (CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c;-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)- (3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)- (CR1aR1b)1-5-A- wherein A is O, S, or NR1c;-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)- A-(CR1aR1b)1-5-A- wherein each A is independently O, S, or NR1c;-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)- (CO)-A-(CR1aR1b)1-5- wherein A is O, S, or NR1c;-(heteroaryl optionally substituted with 0-4 R1aand / or R1bgroups)-A-(CR1aR1b)1-5- wherein A is O, S, or NR1c;-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)- (CO)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c;-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)- (CO)-A-(CR1aR1b)1-5- wherein A is O, S, or NR1c; or-(CO)-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c.

[0316] In some embodiments of the degrader compounds of formula IA-11-VHL or formula IA-12-VHL, each R1a, each R1b, and each R1cis independently H or C1-C6alkyl. In some embodiments of the degrader compound of formula IA-11-VHL or formula IA-12-VHL, R1is -(CR1aR1b)1-5, such as, for example, -CH2-, -CH2CH2-, -CH2CH2CH2- -CH2CH2CH2CH2-, - CH2CH2CH2CH2CH2-, and the like.

[0317] In some embodiments of the degrader compound of formula IA-11-VHL or formula IA-12-VHL, R1is -(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, such as, for example, -CH2- O-, -CH2CH2-O-, -CH2CH2CH2-O-, and the like. In some embodiments of the compounds of formula I, R1is -(CR1aR1b)1-5-A-(CR1aR1b)1-5- wherein A is O, S, or NR1c, such as, for example, -CH2CH2CH2-N(CH3)-CH2CH2-, -CH2CH2-N(CH3)-CH2CH2-, -CH2CH2-O-CH2-, and the like.

[0318] In some embodiments of the degrader compounds of formula I, R1is -(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CO)- (CR1aR1b)1-5-A- wherein A is O, S, or NR1c, such as, for example, -piperidinyl-(CO)- CH(CH3)-O-, -pyrrolidinyl-(CO)-CH(CH3)-O-, -piperidinyl-(CO)-CH2-O-, - methylpiperidinyl-(CO)-CH2-O-, and the like. In some embodiments of the degrader compounds of formula I, R1is -(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CO)-A-(CR1aR1b)1-5- wherein A is O, S, or NR1c, such as, for example, -piperidinyl-(CO)-O-CH2-, and the like.

[0319] In some embodiments of the degrader compounds of formula I, R1is -(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5- A- wherein A is O, S, or NR1c, such as, for example, -azabicyclo[3.1.1 ]heptanyl-CH2CH2-O-,- azaspiro[3.3]heptanyl-CH2CH2-O-, -piperidinyl-CH2CH2-O-, -fluoropiperidinyl-CH2CH2- O-, -azepanyl-CH2CH2-O-, -pyrrolidinyl-CH2CH2-O-, -piperidinyl-CH2CH(CH3)-O-, - octahydrocyclopenta[c]pyrrolyl-CH2CH2-O-, -pyrrolidinyl-CH2CH(CH3)-O-, - methylpiperidinyl-CH2CH2-O-, -piperidinyl-CH2CH(CH2CH3)-O-, -pyrrolidinyl- CH2CH(CH2CH3)-O-, -pyrrolidinyl-CH2CH(CH3)-O-, -hydroxypyrrolidinyl-CH2CH2-O-, - hydroxypiperidinyl-CH2CH2-O-, and the like.

[0320] In some embodiments of the degrader compounds of formula I, R1is -(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-, such as, for example, -piperidinyl-CH2-, -piperidinyl-CH2CH2-, -piperidinyl-CH2CH2CH2-, azetidinyl- CH2CH2CH2-, -aziridinyl-CH2-, -pyrrolidinyl-CH2CH2-, and the like.

[0321] In some embodiments of the degrader compounds of formula I, R1is -(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5- A- wherein A is O, S, or NR1c, such as, for example, -piperidinyl-pyrrolidinyl-CH2CH2-O-, - piperidinyl- piperidinyl-CH2CH2-O-, -pyrrolidinyl-piperidinyl-CH2CH2-O-, and the like.

[0322] In some embodiments of the degrader compounds of formula I, R1is -(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5- (3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)- (CR1aR1b)1-5-A- wherein A is O, S, or NR1c, such as, for example, -piperidinyl-CH2- piperidinyl-CH2CH2-O-, -piperidinyl-CH2CH2-piperidinyl-CH2CH2-O-, and the like.

[0323] In some embodiments of the degrader compounds of formula I, R1is -(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-A-(CR1aR1b)1-5- wherein each A is independently O, S, or NR1c, such as, for example, -cyclohexyl-N(CH3)- CH2CH2-O-, and the like.

[0324] In some embodiments of the degrader compounds of formula I, R1is -(CO)-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5- A- wherein A is O, S, or NR1c, such as, for example, -(CO)-piperidinyl-CH2CH2-O-, and the like.

[0325] In some embodiments of the degrader compounds of formula I, R1is -(CR1aR1b)1-5-(3- 11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-, such as, for example, -CH2-piperidinyl-CH2-, -CH2-piperidinyl-CH2CH2-, -CH2- piperidinyl-CH2CH2CH2-, and the like.

[0326] In some embodiments of the degrader compounds of formula I, R1is -(CR1aR1b)1-5-(3- 11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A-, wherein each A is independently O, S, or NR1c, such as, for example, -CH2- pyrrolidinyl-CH2CH2-O-, -CH2-pyridinyl-CH2CH(CH3)-O-, -CH2-pyridinyl-CH2CH2-O-, - CH(CH3)-pyridinyl-CH2CH2-O-, -CH2-azepanyl-CH2CH(CH3)-O-, -CH2- azabicyclo[3.2.1]octanyl-CH2CH2-O-, -CH2-(dimethyl)piperidinyl-CH2CH2-O-, - CH2dihydropiperidinyl-CH2CH2-O-, and the like.

[0327] In some embodiments of the degrader compounds of formula I, R1is -(CR1aR1b)1-5-(3- 11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-A- wherein A is O, S, or NR1c, such as, for example, -CH2CH2CH2-pyrrolidinyl-O-, and the like. In some embodiments of the degrader compounds of formula I, R1is -(heteroaryl optionally substituted with 0-4 R1aand / or R1bgroups)-A-(CR1aR1b)1-5- wherein A is O, S, or NR1c, such as, for example, -pyridinyl-O-CH2-, and the like. In some embodiments of the degrader compounds of formula I, R1is -A-(3-11 membered heterocyclyl optionally substituted with 0- 6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein each A is independently O, S, or NR1c, such as, for example, -N(CH3)-piperidinyl-CH2CH2-O-, and the like.

[0328] In some aspects, the degrader compounds of Formula I are those having the formula IA-13a-VHL, IA-13b-VHL, IA-14a-VHL or IA-14b-VHL:wherein X is N or CH.

[0329] In some embodiments of the degrader compounds of formula IA-13a-VHL, IA-13b- VHL, IA-14a-VHL or IA-14b-VHL, R1is -(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CO)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, or -(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)- (CR1aR1b)1-5-A- wherein A is O, S, or NR1c, R1a, R1b, R1c, and R1eare each independently, -H, deuterium, -halo, -C1-C8alkyl, -C1-Cehaloalkyl, -O-C1-C8alkyl, -S-C1-C8alkyl, -NHC1- C8alkyl, -N(C1-C8alkyl)2, 3-11 membered cycloalkyl, aryl, heteroaryl, 3-11 membered heterocyclyl, -O-(3-11 membered cycloalkyl), -S-(3-11 membered cycloalkyl), NH-(3-11 membered cycloalkyl), N(3-11 membered cycloalkyl)2, N-(3-11 membered cycloalkyl)(C1- C8alkyl), -OH, -NH2, -SH, -SO2C1-C8alkyl, SO(NH)C1-C8alkyl, P(O)(OC1-C8alkyl)(C1- C8alkyl), -P(O)(OC1-C8alkyl)2, -C=C-C1-C8alkyl, -C=CH, -CH=CH(C1-C8alkyl), -C(C1- C8alkyl)=CH(C1-C8alkyl), -C(C1-C8alkyl)=C(C1-C8alkyl)2, -Si(OH)3, -Si(C1-C8alkyl)3, - Si(OH)(C1-C8alkyl)2, -C(O)C1-C8alkyl, -CO2H, -CN, -CF3, -CHF2, -CH2F, -NO2, -SF5, - SO2NHC1-C8alkyl, -SO2N(C1-C8alkyl)2, -SO(NH)NHC1-C8alkyl, -SO(NH)N(C1-C8alkyl)2, - SONHC1-C8alkyl, -SON(C1-C8alkyl)2, -CONHC1-C8alkyl, -CON(C1-C8alkyl)2, -N(C1- C8alkyl)CONH(C1-C8alkyl), -N(C1-C8alkyl)CON(C1-C8alkyl)2, -NHCONH(C1-C8alkyl), -NHCON(C1-C8alkyl)2, -NHCONH2, -N(C1-C8alkyl)SO2NH(C1-C8alkyl), -N(C1- C8alkyl)SO2N(C1-C8alkyl)2, -NHSO2NH(C1-C8alkyl), -NHSO2N(C1-C8alkyl)2, or - NHSO2NH2; or where the context permits, R1aor R1b, are linked to other groups, or to each other, to form a cycloalkyl and / or a heterocyclyl moiety, optionally substituted with 0-4 R1egroups.

[0330] In some embodiments of the degrader compounds of formula IA-13a-VHL, IA-13b- VHL, IA-14a-VHL or IA-14b-VHL, R1is-(3-11 membered heterocyclyl)-(CO)-(CR1aR1b)i-3- O- wherein each R1ais H, C1-3alkyl, or halo, and each R1bis independently H or -C1-C8alkyl, preferably -CH3.

[0331] In other embodiments of the degrader compounds of formula IA-13a-VHL, IA-13b- VHL-VHL, IA-14a-VHL or IA-14b-VHL, R1is -(3-11 membered heterocyclyl)-(CR1aR1b)1-3- O-, wherein each R1ais H, C1-3alkyl, or halo, and each R1bis independently H or -C1-C8alkyl, preferably -CH3.

[0332] In other embodiments of the degrader compounds of formula IA-13a-VHL, IA-13b- VHL, IA-14a-VHL or IA-14b-VHL, R1is -azabicyclo[3.1.1]heptanyl-CH2CH2-O-, - azaspiro[3.3]heptanyl-CH2CH2-O-, -piperidinyl-CH2CH2-O-, -fluoropiperidinyl-CH2CH2-O-, -azepanyl-CH2CH2-O-, -pyrrolidinyl-CH2CH2-O-, -piperidinyl-CH2CH(CH3)-O-, - octahydrocyclopenta[c]pyrrolyl-CH2CH2-O-, -pyrrolidinyl-CH2CH(CH3)-O-, - methylpiperidinyl-CH2CH2-O-, -piperidinyl-CH2CH(CH2CH3)-O-, -pyrrolidinyl- CH2CH(CH2CH3)-O-, -pyrrolidinyl-CH2CH(CH3)-O-, -hydroxypyrrolidinyl-CH2CH2-O-, - hydroxypiperidinyl-CH2CH2-O-, and the like.

[0333] In some aspects, the degrader compounds of Formula I are those having the formula IA-15a-VHL, IA-15b-VHL, IA-16a-VHL, or IA-16b-VHL:wherein A is O, S, or NR1c,R1a1is H or -C1-C8alkyl, preferably -CH2CH3, or -CH3;R1cis -H, or -C1-C8alkyl, preferably -CH3;A1is a covalent bond or -(CR1aR1b)i -3; and each Rkis independently H, deuterium, F, C1-3alkyl, C1-3haloalkyl, C1-4alkoxyl, substituted C1-3alkyl, substituted C1-3haloalkyl, or substituted C1-4alkoxyl; and s = 0-7.

[0334] In some embodiments of the degrader compound of formula IA-15a-VHL, IA-15b- VHL, IA-16a-VHL, or IA-16b-VHL, A is O and R1a1is -C1-C8alkyl, preferably -CH2CH3, or -CH3. In some embodiments of the degrader compound of formula IA-15a-VHL, IA-15b- VHL, IA-16a-VHL, or IA-16b-VHL, A is O and R1a1is -CH3.

[0335] In some embodiments of the degrader compound of formula IA-15a-VHL, IA-15b- VHL, IA-16a-VHL, or IA-16b-VHL, A1is a covalent bond. In some embodiments of thedegrader compound of formula IA-15a-VHL, IA-15b-VHL, IA-16a-VHL, or IA-16b-VHL, A1is -(CR1aR1b)1-3.

[0336] In some embodiments of the degrader compound of formula IA-15a-VHL, IA-15b- VHL, IA-16a-VHL, or IA-16b-VHL, s=0. In some embodiments of the degrader compound of formula IA-15a-VHL, IA-15b-VHL, IA-16a-VHL, or IA-16b-VHL, s=l and Rkis -CH3.

[0337] In some embodiments, the degrader compound comprises a small molecule E3 Ubiquitin Ligase binding moiety that binds a Von Hippel-Lindau E3 Ubiquitin Ligase (VHL). In some embodiments, the degrader compound is:(2S,4R)-4-hydroxy-l-((S)-2-(2-((R)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10-hexahydro- 8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8-yl)acetamido)-3,3- dimethylbutanoyl)-N-((S)-l-(4-(4-methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2- carboxamide;(2S,4R)-4-hydroxy-l-((S)-2-(2-((S)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10-hexahydro- 8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8-yl)acetamido)-3,3- dimethylbutanoyl)-N-((S)-l-(4-(4-methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2- carboxamide;(2S,4R)-4-hydroxy-l-((S)-2-(2-((S)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10-hexahydro- 8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8-yl)acetamido)-3,3- dimethylbutanoyl)-N-(4-(5-methylthiazol-4-yl)benzyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((S)-2-(2-((R)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10-hexahydro- 8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8-yl)acetamido)-3,3- dimethylbutanoyl)-N-(4-(5-methylthiazol-4-yl)benzyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((S)-2-(2-(4-(((S)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10- hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8-yl)methyl)-4- methylpiperidin-l-yl)acetamido)-3,3-dimethylbutanoyl)-N-((S)-l-(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((S)-2-(2-(4-(((R)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10- hexahydro-8H-pyrazino[ 1 ',2' :4,5]pyrazino[2,3 -c]pyridazin-8-yl)methyl)piperidin- 1 - yl)acetamido)-3,3-dimethylbutanoyl)-N-((S)-l-(4-(4-methylthiazol-5- yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-((S)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10- hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8-yl)ethoxy)isoxazol-5- yl)-3-methylbutanoyl)-N-((S)-l-(4-(4-methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2- carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-((R)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10- hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8-yl)ethoxy)isoxazol-5- yl)-3-methylbutanoyl)-N-((S)-l-(4-(4-methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2- carboxamide;(2S,4R)-4-hydroxy-l-((S)-2-(3-(2-(4-(((S)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10- hexahydro-8H-pyrazino[ 1 ',2' :4,5]pyrazino[2,3 -c]pyridazin-8-yl)methyl)piperidin- 1 - yl)ethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4-methylthiazol-5- yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((S)-2-(3-(2-(4-(((R)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10- hexahydro-8H-pyrazino[ 1 ',2' :4,5]pyrazino[2,3 -c]pyridazin-8-yl)methyl)piperidin- 1 - yl)ethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4-methylthiazol-5- yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((S)-2-(4-((R)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10-hexahydro- 8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8-yl)butanamido)-3,3- dimethylbutanoyl)-N-((S)-l-(4-(4-methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2- carboxamide;(2S,4R)-4-hydroxy-l-((S)-2-(4-((S)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10-hexahydro- 8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8-yl)butanamido)-3,3- dimethylbutanoyl)-N-((S)-l-(4-(4-methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2- carboxamide;2-((S)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10-hexahydro-8H- pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8-yl)ethyl ((R)-l-((2S,4R)-4-hydroxy-2- (((S)-l-(4-(4-methylthiazol-5-yl)phenyl)ethyl)carbamoyl)pyrrolidin-l-yl)-3,3- dimethyl- 1 -oxobutan-2-yl)carbamate;2-((R)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10-hexahydro-8H- pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8-yl)ethyl ((R)-l-((2S,4R)-4-hydroxy-2- (((S)-l-(4-(4-methylthiazol-5-yl)phenyl)ethyl)carbamoyl)pyrrolidin-l-yl)-3,3- dimethyl- 1 -oxobutan-2-yl)carbamate;(2S,4R)-4-hydroxy-l-((S)-2-(3-(4-(((S)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10- hexahydro-8H-pyrazino[ 1 ',2' :4,5]pyrazino[2,3 -c]pyridazin-8-yl)methyl)piperidin- 1 - yl)propanamido)-3,3-dimethylbutanoyl)-N-((S)-l-(4-(4-methylthiazol-5- yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((S)-2-(3-(4-(((R)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10- hexahydro-8H-pyrazino[ 1 ',2' :4,5]pyrazino[2,3 -c]pyridazin-8-yl)methyl)piperidin- 1 -yl)propanamido)-3,3-dimethylbutanoyl)-N-((S)-l-(4-(4-methylthiazol-5- yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(3R,5S)-l-((R)-2-(3-(2-((S)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10-hexahydro-8H- pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8-yl)ethoxy)isoxazol-5-yl)-3- methylbutanoyl)-5-(((S)-l-(4-(4-methylthiazol-5- yl)phenyl)ethyl)carbamoyl)pyrrolidin-3-yl acetate;(3R,5S)-l-((R)-2-(3-(2-((R)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10-hexahydro-8H- pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8-yl)ethoxy)isoxazol-5-yl)-3- methylbutanoyl)-5-(((S)-l-(4-(4-methylthiazol-5- yl)phenyl)ethyl)carbamoyl)pyrrolidin-3-yl acetate;(3R,5S)-l-((R)-2-(3-(2-((S)-2-(2- hydroxyphenyl)-5,6,6a,7,9,10-hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3- c]pyridazin-8-yl)ethoxy)isoxazol-5-yl)-3-methylbutanoyl)-5-(((S)-l-(4-(4- methylthiazol-5-yl)phenyl)ethyl)carbamoyl)pyrrolidin-3-yl isobutyrate;(3R,5S)-l-((R)-2-(3-(2-((R)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10-hexahydro-8H- pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8-yl)ethoxy)isoxazol-5-yl)-3- methylbutanoyl)-5-(((S)-l-(4-(4-methylthiazol-5- yl)phenyl)ethyl)carbamoyl)pyrrolidin-3-yl isobutyrate;(2S,4R)-4-hydroxy-l-((S)-2-(2-(4-((S)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10-hexahydro- 8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8-yl)piperidin-l-yl)acetamido)-3,3- dimethylbutanoyl)-N-((S)-l-(4-(4-methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2- carboxamide;(2S,4R)-4-hydroxy-l-((S)-2-(2-(4-((R)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10- hexahydro-8H-pyrazino[ 1 ',2' :4,5]pyrazino[2,3 -c]pyridazin-8-yl)piperidin- 1 - yl)acetamido)-3,3-dimethylbutanoyl)-N-((S)-l-(4-(4-methylthiazol-5- yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((2R)-2-(3-(2-(6-((S)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10- hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8-yl)-3- azabicyclo[3.1.1]heptan-3-yl)ethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4- (4-methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((2R)-2-(3-(2-(6-((R)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10- hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8-yl)-3- azabicyclo[3.1.1]heptan-3-yl)ethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4- (4-methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-(6-((S)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10- hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8-yl)-2- azaspiro[3.3]heptan-2-yl)ethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-(6-((R)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10- hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8-yl)-2- azaspiro[3.3]heptan-2-yl)ethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(((R)-l-(4-((S)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10- hexahydro-8H-pyrazino[ 1 ',2' :4,5]pyrazino[2,3 -c]pyridazin-8-yl)piperidin- 1 - yl)propan-2-yl)oxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4-methylthiazol-5- yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(((S)-l-(4-((S)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10- hexahydro-8H-pyrazino[ 1 ',2' :4,5]pyrazino[2,3 -c]pyridazin-8-yl)piperidin- 1 - yl)propan-2-yl)oxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4-methylthiazol-5- yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(((R)-l-(4-((S)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10- hexahydro-8H-pyrazino[ 1 ',2' :4,5]pyrazino[2,3 -c]pyridazin-8-yl)piperidin- 1 - yl)propan-2-yl)oxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4-methylthiazol-5- yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(((S)-l-(4-((R)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10- hexahydro-8H-pyrazino[ 1 ',2' :4,5]pyrazino[2,3 -c]pyridazin-8-yl)piperidin- 1 - yl)propan-2-yl)oxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4-methylthiazol-5- yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-((S)-3-((S)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10- hexahydro-8H-pyrazino[ 1 ',2' :4,5]pyrazino[2,3 -c]pyridazin-8-yl)pyrrolidin- 1 - yl)ethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4-methylthiazol-5- yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-((R)-3-((S)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10- hexahydro-8H-pyrazino[ 1 ',2' :4,5]pyrazino[2,3 -c]pyridazin-8-yl)pyrrolidin- 1 - yl)ethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4-methylthiazol-5- yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-((S)-3-((S)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10- hexahydro-8H-pyrazino[ 1 ',2' :4,5]pyrazino[2,3 -c]pyridazin-8-yl)pyrrolidin- 1 -yl)ethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4-methylthiazol-5- yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-((R)-3-((R)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10- hexahydro-8H-pyrazino[ 1 ',2' :4,5]pyrazino[2,3 -c]pyridazin-8-yl)pyrrolidin- 1 - yl)ethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4-methylthiazol-5- yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(((S)-l-((S)-3-(((S)-2-(2-hydroxyphenyl)- 5,6,6a,7,9,10-hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8- yl)methyl)piperidin-l-yl)propan-2-yl)oxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l- (4-(4-methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(((S)-l-((S)-3-(((R)-2-(2-hydroxyphenyl)- 5,6,6a,7,9,10-hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8- yl)methyl)piperidin-l-yl)propan-2-yl)oxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l- (4-(4-methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(((S)-l-((R)-3-(((S)-2-(2-hydroxyphenyl)- 5,6,6a,7,9,10-hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8- yl)methyl)piperidin-l-yl)propan-2-yl)oxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l- (4-(4-methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(((S)-l-((R)-3-(((R)-2-(2-hydroxyphenyl)- 5,6,6a,7,9,10-hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8- yl)methyl)piperidin-l-yl)propan-2-yl)oxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l- (4-(4-methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy- 1 -((R)-2-(3 -(((R)- 1 -((S)-3 -(((S)-2-(2-hydroxyphenyl)- 5,6,6a,7,9,10-hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8- yl)methyl)piperidin-l-yl)propan-2-yl)oxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l- (4-(4-methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy- 1 -((R)-2-(3 -(((R)- 1 -((S)-3 -(((R)-2-(2-hydroxyphenyl)- 5,6,6a,7,9,10-hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8- yl)methyl)piperidin-l-yl)propan-2-yl)oxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l- (4-(4-methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy- 1 -((R)-2-(3 -(((R)- 1 -((R)-3 -(((S)-2-(2-hydroxyphenyl)- 5,6,6a,7,9,10-hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8- yl)methyl)piperidin-l-yl)propan-2-yl)oxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l- (4-(4-methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2 S,4R)-4-hy droxy- 1 -((R)-2-(3 -(((R)- 1 -((R)-3 -(((R)-2-(2-hydroxyphenyl)- 5,6,6a,7,9,10-hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8- yl)methyl)piperidin-l-yl)propan-2-yl)oxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l- (4-(4-methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-((S)-3-(4-((S)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10- hexahydro-8H-pyrazino[ 1 ',2' :4,5]pyrazino[2,3 -c]pyridazin-8-yl)piperidin- 1 - yl)pyrrolidin-l-yl)ethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-((R)-3-(4-((S)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10- hexahydro-8H-pyrazino[ 1 ',2' :4,5]pyrazino[2,3 -c]pyridazin-8-yl)piperidin- 1 - yl)pyrrolidin-l-yl)ethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-((R)-3-(4-((R)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10- hexahydro-8H-pyrazino[ 1 ',2' :4,5]pyrazino[2,3 -c]pyridazin-8-yl)piperidin- 1 - yl)pyrrolidin-l-yl)ethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-((S)-3-(4-((R)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10- hexahydro-8H-pyrazino[ 1 ',2' :4,5]pyrazino[2,3 -c]pyridazin-8-yl)piperidin- 1 - yl)pyrrolidin-l-yl)ethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-((S)-3-(4-((S)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10- hexahydro-8H-pyrazino[ 1 ',2' :4,5]pyrazino[2,3 -c]pyridazin-8-yl)piperidin- 1 - yl)pyrrolidin-l-yl)ethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-((S)-3-(4-((R)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10- hexahydro-8H-pyrazino[ 1 ',2' :4,5]pyrazino[2,3 -c]pyridazin-8-yl)piperidin- 1 - yl)pyrrolidin-l-yl)ethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-((R)-3-(4-((S)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10- hexahydro-8H-pyrazino[ 1 ',2' :4,5]pyrazino[2,3 -c]pyridazin-8-yl)piperidin- 1 - yl)pyrrolidin-l-yl)ethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-((R)-3-(4-((R)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10- hexahydro-8H-pyrazino[ 1 ',2' :4,5]pyrazino[2,3 -c]pyridazin-8-yl)piperidin- 1 -yl)pyrrolidin-l-yl)ethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-((3S,4R)-4-((S)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10-hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8-yl)-3- methylpiperidin-l-yl)-2-oxoethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-((3S,4S)-4-((S)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10-hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8-yl)-3- methylpiperidin-l-yl)-2-oxoethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-((3R,4R)-4-((S)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10-hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8-yl)-3- methylpiperidin-l-yl)-2-oxoethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-((3R,4S)-4-((S)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10-hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8-yl)-3- methylpiperidin-l-yl)-2-oxoethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-((3S,4R)-4-((R)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10-hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8-yl)-3- methylpiperidin-l-yl)-2-oxoethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-((3R,4R)-4-((R)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10-hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8-yl)-3- methylpiperidin-l-yl)-2-oxoethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-((3R,4S)-4-((R)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10-hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8-yl)-3- methylpiperidin-l-yl)-2-oxoethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-((3S,4S)-4-((R)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10-hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8-yl)-3- methylpiperidin-l-yl)-2-oxoethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-((S)-3-((S)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10- hexahydro-8H-pyrazino[ 1 ',2' :4,5]pyrazino[2,3 -c]pyridazin-8-yl)piperidin- 1 - yl)ethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4-methylthiazol-5- yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-((R)-3-((S)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10- hexahydro-8H-pyrazino[ 1 ',2' :4,5]pyrazino[2,3 -c]pyridazin-8-yl)piperidin- 1 - yl)ethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4-methylthiazol-5- yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-((R)-3-((R)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10- hexahydro-8H-pyrazino[ 1 ',2' :4,5]pyrazino[2,3 -c]pyridazin-8-yl)piperidin- 1 - yl)ethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4-methylthiazol-5- yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-((S)-3-((R)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10- hexahydro-8H-pyrazino[ 1 ',2' :4,5]pyrazino[2,3 -c]pyridazin-8-yl)piperidin- 1 - yl)ethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4-methylthiazol-5- yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(((S)-l-((R)-3-((S)-2-(2-hydroxyphenyl)- 5,6,6a,7,9,10-hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8- yl)pyrrolidin-l-yl)propan-2-yl)oxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(((S)-l-((S)-3-((S)-2-(2-hydroxyphenyl)- 5,6,6a,7,9,10-hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8- yl)pyrrolidin-l-yl)propan-2-yl)oxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(((S)-l-((S)-3-((R)-2-(2-hydroxyphenyl)- 5,6,6a,7,9,10-hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8- yl)pyrrolidin-l-yl)propan-2-yl)oxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2 S,4R)-4-hy droxy- 1 -((R)-2-(3 -(((S)- 1 -((R)-3 -((R)-2-(2-hydroxyphenyl)- 5,6,6a,7,9,10-hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8- yl)pyrrolidin-l-yl)propan-2-yl)oxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2 S,4R)-4-hy droxy- 1 -((R)-2-(3 -(((R)- 1 -((R)-3 -((S)-2-(2-hy droxyphenyl)- 5,6,6a,7,9,10-hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8-yl)pyrrolidin-l-yl)propan-2-yl)oxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy- 1 -((R)-2-(3 -(((R)- 1 -((S)-3 -((S)-2-(2-hydroxyphenyl)- 5,6,6a,7,9,10-hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8- yl)pyrrolidin-l-yl)propan-2-yl)oxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy- 1 -((R)-2-(3 -(((R)- 1 -((S)-3 -((R)-2-(2-hydroxyphenyl)- 5,6,6a,7,9,10-hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8- yl)pyrrolidin-l-yl)propan-2-yl)oxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy- 1 -((R)-2-(3 -(((R)- 1 -((R)-3 -((R)-2-(2-hydroxyphenyl)- 5,6,6a,7,9,10-hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8- yl)pyrrolidin-l-yl)propan-2-yl)oxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-((2R,4R)-4-((S)-2-(2-hydroxyphenyl)- 5,6,6a,7,9,10-hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8-yl)-2- methylpiperidin-l-yl)ethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-((2S,4R)-4-((S)-2-(2-hydroxyphenyl)- 5,6,6a,7,9,10-hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8-yl)-2- methylpiperidin-l-yl)ethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-((2R,4S)-4-((S)-2-(2-hydroxyphenyl)- 5,6,6a,7,9,10-hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8-yl)-2- methylpiperidin-l-yl)ethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-((2S,4S)-4-((S)-2-(2-hydroxyphenyl)- 5,6,6a,7,9,10-hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8-yl)-2- methylpiperidin-l-yl)ethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-((2R,4R)-4-((R)-2-(2-hydroxyphenyl)- 5,6,6a,7,9,10-hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8-yl)-2- methylpiperidin-l-yl)ethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-((2S,4R)-4-((R)-2-(2-hydroxyphenyl)- 5,6,6a,7,9,10-hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8-yl)-2- methylpiperidin-l-yl)ethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-((2R,4S)-4-((R)-2-(2-hydroxyphenyl)- 5,6,6a,7,9,10-hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8-yl)-2- methylpiperidin-l-yl)ethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-((2S,4S)-4-((R)-2-(2-hydroxyphenyl)- 5,6,6a,7,9,10-hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8-yl)-2- methylpiperidin-l-yl)ethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-((3R,4S)-4-((S)-2-(2-hydroxyphenyl)- 5,6,6a,7,9,10-hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8-yl)-3- methylpiperidin-l-yl)ethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-((3S,4R)-4-((S)-2-(2-hydroxyphenyl)- 5,6,6a,7,9,10-hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8-yl)-3- methylpiperidin-l-yl)ethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-((3R,4R)-4-((S)-2-(2-hydroxyphenyl)- 5,6,6a,7,9,10-hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8-yl)-3- methylpiperidin-l-yl)ethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-((3S,4S)-4-((S)-2-(2-hydroxyphenyl)- 5,6,6a,7,9,10-hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8-yl)-3- methylpiperidin-l-yl)ethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-((3R,4S)-4-((R)-2-(2-hydroxyphenyl)- 5,6,6a,7,9,10-hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8-yl)-3- methylpiperidin-l-yl)ethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-((3S,4R)-4-((R)-2-(2-hydroxyphenyl)- 5,6,6a,7,9,10-hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8-yl)-3-methylpiperidin-l-yl)ethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-((3R,4R)-4-((R)-2-(2-hydroxyphenyl)- 5,6,6a,7,9,10-hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8-yl)-3- methylpiperidin-l-yl)ethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-((3S,4S)-4-((R)-2-(2-hydroxyphenyl)- 5,6,6a,7,9,10-hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8-yl)-3- methylpiperidin-l-yl)ethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-(4-((S)-l-((S)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10- hexahydro-8H-pyrazino[ 1 ',2' :4,5]pyrazino[2,3 -c]pyridazin-8-yl)ethyl)piperidin- 1 - yl)ethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4-methylthiazol-5- yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-(4-((R)-l-((S)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10- hexahydro-8H-pyrazino[ 1 ',2' :4,5]pyrazino[2,3 -c]pyridazin-8-yl)ethyl)piperidin- 1 - yl)ethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4-methylthiazol-5- yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-(4-((S)-l-((R)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10- hexahydro-8H-pyrazino[ 1 ',2' :4,5]pyrazino[2,3 -c]pyridazin-8-yl)ethyl)piperidin- 1 - yl)ethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4-methylthiazol-5- yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-(4-((R)-l-((R)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10- hexahydro-8H-pyrazino[ 1 ',2' :4,5]pyrazino[2,3 -c]pyridazin-8-yl)ethyl)piperidin- 1 - yl)ethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4-methylthiazol-5- yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-(4-((R)-3-((S)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10- hexahydro-8H-pyrazino[ 1 ',2' :4,5]pyrazino[2,3 -c]pyridazin-8-yl)pyrrolidin- 1 - yl)piperidin- 1 -yl)ethoxy)isoxazol-5-yl)-3 -methylbutanoyl)-N-((S)- 1 -(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-(4-((S)-3-((S)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10- hexahydro-8H-pyrazino[ 1 ',2' :4,5]pyrazino[2,3 -c]pyridazin-8-yl)pyrrolidin- 1 - yl)piperidin- 1 -yl)ethoxy)isoxazol-5-yl)-3 -methylbutanoyl)-N-((S)- 1 -(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-(4-((S)-3-((R)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10- hexahydro-8H-pyrazino[ 1 ',2' :4,5]pyrazino[2,3 -c]pyridazin-8-yl)pyrrolidin- 1 - yl)piperidin- 1 -yl)ethoxy)isoxazol-5-yl)-3 -methylbutanoyl)-N-((S)- 1 -(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-(4-((R)-3-((R)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10- hexahydro-8H-pyrazino[ 1 ',2' :4,5]pyrazino[2,3 -c]pyridazin-8-yl)pyrrolidin- 1 - yl)piperidin- 1 -yl)ethoxy)isoxazol-5-yl)-3 -methylbutanoyl)-N-((S)- 1 -(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-((S)-3-(((S)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10- hexahydro-8H-pyrazino[ 1 ',2' :4,5]pyrazino[2,3 -c]pyridazin-8-yl)methyl)piperidin- 1 - yl)ethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4-methylthiazol-5- yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-((R)-3-(((S)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10- hexahydro-8H-pyrazino[ 1 ',2' :4,5]pyrazino[2,3 -c]pyridazin-8-yl)methyl)piperidin- 1 - yl)ethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4-methylthiazol-5- yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-((R)-3-(((R)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10- hexahydro-8H-pyrazino[ 1 ',2' :4,5]pyrazino[2,3 -c]pyridazin-8-yl)methyl)piperidin- 1 - yl)ethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4-methylthiazol-5- yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-((S)-3-(((R)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10- hexahydro-8H-pyrazino[ 1 ',2' :4,5]pyrazino[2,3 -c]pyridazin-8-yl)methyl)piperidin- 1 - yl)ethoxy)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4-methylthiazol-5- yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(3-((S)-3-(((S)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10- hexahydro-8H-pyrazino[ 1 ',2' :4,5]pyrazino[2,3 -c]pyridazin-8-yl)methyl)piperidin- 1 - yl)propyl)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4-methylthiazol-5- yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(3-((R)-3-(((S)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10- hexahydro-8H-pyrazino[ 1 ',2' :4,5]pyrazino[2,3 -c]pyridazin-8-yl)methyl)piperidin- 1 - yl)propyl)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4-methylthiazol-5- yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(3-((R)-3-(((R)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10- hexahydro-8H-pyrazino[ 1 ',2' :4,5]pyrazino[2,3 -c]pyridazin-8-yl)methyl)piperidin- 1 -yl)propyl)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4-methylthiazol-5- yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(3-((S)-3-(((R)-2-(2-hydroxyphenyl)-5,6,6a,7,9,10- hexahydro-8H-pyrazino[ 1 ',2' :4,5]pyrazino[2,3 -c]pyridazin-8-yl)methyl)piperidin- 1 - yl)propyl)isoxazol-5-yl)-3-methylbutanoyl)-N-((S)-l-(4-(4-methylthiazol-5- yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-(4-((6S,6aS)-2-(2-hydroxyphenyl)-6-methyl- 5,6,6a,7,9,10-hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8- yl)piperidin- 1 -yl)ethoxy)isoxazol-5-yl)-3 -methylbutanoyl)-N-((S)- 1 -(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-(4-((6R,6aS)-2-(2-hydroxyphenyl)-6-methyl- 5,6,6a,7,9,10-hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8- yl)piperidin- 1 -yl)ethoxy)isoxazol-5-yl)-3 -methylbutanoyl)-N-((S)- 1 -(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide;(2S,4R)-4-hydroxy-l-((R)-2-(3-(2-(4-((6R,6aR)-2-(2-hydroxyphenyl)-6-methyl- 5,6,6a,7,9,10-hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8- yl)piperidin- 1 -yl)ethoxy)isoxazol-5-yl)-3 -methylbutanoyl)-N-((S)- 1 -(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide; or (2S,4R)-4-hydroxy-l-((R)-2-(3-(2-(4-((6S,6aR)-2-(2-hydroxyphenyl)-6-methyl- 5,6,6a,7,9,10-hexahydro-8H-pyrazino[ 1',2':4,5]pyrazino[2,3-c]pyridazin-8- yl)piperidin- 1 -yl)ethoxy)isoxazol-5-yl)-3 -methylbutanoyl)-N-((S)- 1 -(4-(4- methylthiazol-5-yl)phenyl)ethyl)pyrrolidine-2-carboxamide.Cereblon E3 Ubiquitin Ligase (CRBN)

[0338] In some aspects, the ULM moiety in the degrader compounds of the disclosure is a small molecule E3 Ubiquitin Ligase binding moiety that binds a Cereblon E3 Ubiquitin Ligase (CRBN). Such ULM moieties that bind to CRBN are known to those of skill in the art. Methods of determining whether a small molecule binds a Cereblon E3 Ubiquitin Ligase are known in the art, for example, see Lai A.C., Crews C.M. Nat Rev Drug Discov.2017; 16(2): 101-114.

[0339] In some embodiments, the ULM is a previously described ULM.

[0340] In some embodiments, the ULM is a ULM moiety described in WO 2020 / 010227, the entirety of which is incorporated by reference herein. In other embodiments, the ULM is a ULM moiety described in WO 2020 / 081450, the entirety of which is incorporated byreference herein. In other embodiments, the ULM is a ULM moiety described in WO 2018 / 102725, the entirety of which is incorporated by reference herein.

[0341] In some embodiments, the ULM is a moiety having the Formula ULM-Iwherein:is a point of attachment to R1of PTM Formula IA;Ring A is a monocyclic, bicyclic or tricyclic aryl, heteroaryl or heterocycloalkyl group, L1is a bond, -O-, -S-, -NRa-, -C(Ra)2-, or -C(O)NRa-;X1is a bond, -C(O)-, -C(S)-, -CH2-, -CHCF3-, SO2-, -S(O), P(O)Rb- or -P(O)ORb-;X2is -C(Ra)2-, -NRa- or -S-;R2is H, deuterium, optionally substituted C1-4alkyl, C1-4alkoxyl, C1-4haloalkyl, -CN, -ORa, -ORbor -SRb; each R3is independently H, deuterium, halogen, oxo, -OH, -CN, -NO2, -C1-C6alkyl, - C2-C6alkenyl, -C2-C6alkynyl, C0-C1alk-aryl, C0-C1alk-heteroaryl, cycloalkyl, cycloalkenyl, heterocycloalkyl, or heterocycloalkenyl, -ORa, -SRa, -NRc2Rd, -NRaRc2, -C(O)Rb, -OC(O)Ra, -C(O)ORa, -C(O)NRc2Rd, -S(O)Rb, -S(O)2NRc2Rd, -S(O)(=NRb)Rb, -SF5, -P(O)RbRb, - P(O)(ORb)(ORb), -B(ORd)(ORc2) or -S(O)2Rb; each Rais independently H, deuterium, -C(O)Rb, -C(O)ORc2, -C(O)NRc2Rd, - C(=NRb)NRbRc2-C(=NORb)NRbRc2-C(=NCN)NRbRc2-P(ORc2)2, - P(O)Rc2Rb, -P(O)ORc2ORb, -S(O)Rb, -S(O)NRc2Rd, -S(O)2Rb, -S(O)2NRc2Rd, SiRb3, -C1-C10alkyl, -C2-C10alkenyl, -C2-C10alkynyl, aryl, cycloalkyl, cycloalkenyl, heteroaryl, heterocycloalkyl, or heterocycloalkenyl; each Rb, is independently H, deuterium, -C1-C6alkyl, -C2-C6alkenyl, -C2-C6alkynyl, aryl, cycloalkyl, cycloalkenyl, heteroaryl, heterocycloalkyl, or heterocycloalkenyl; each Rc2or Rdis independently H, deuterium, -C1-C10alkyl, -C2-C6alkenyl, -C2-C6alkynyl, -OC1-C6alkyl, -O-cycloalkyl, aryl, heteroaryl, cycloalkyl, cycloalkenyl, heterocycloalkyl, or heterocycloalkenyl;or Rc2and Rd, together with the atom to which they are both attached, form a monocyclic or multicyclic heterocycloalkyl, or a monocyclic or multicyclic heterocyclo-alkenyl group; o is 1, 2, 3, 4, or 5.

[0342] In some embodiments of ULM-I-CRBN, Ring A is a bicyclic or tricyclic heteroaryl or heterocycloalkyl group. In some embodiments of ULM-1, Ring A is heteroaryl bicyclic. In some embodiments of ULM-1, Ring A is heteroaryl tricyclic. In some embodiments of ULM- 1, Ring A is heterobicycloalkyl. In some embodiments of ULM-1, Ring A is heterotri cycloalkyl .

[0343] In other embodiments of ULM-I-CRBN, Ring A is a monocyclic heteroaryl having at least one N atom. In other embodiments of ULM-I-CRBN, Ring A is a pyridine or a pyridazine. In other embodiments of ULM-I-CRBN, Ring A isorwhereinis a point of attachment to PTM and ** is a point of attachment to L1.

[0344] In yet other embodiments, Ring A iswhereinis a point of attachment to PTM and ** is a point of attachment to L1. In yet other embodiments, Ring A iswhereinis a point of attachment to PTM and ** is a point of attachment to L1.

[0345] In other embodiments of ULM-I-CRBN, Ring A is a bicyclic heteroaryl having at least one N atom. In other embodiments of ULM-I-CRBN, Ring A is an isoindolin-one, an isoindolin-dione, an isoquinolin-one or an an isoquinolin-dione. In other embodiments ofULM-I-CRBN, Ring A iswherein is a point of attachment to PTM and** is a point of attachment to L1.

[0346] In yet other embodiments, Ring A iswhereinis a point of attachment to PTM and ** is a point of attachment to L1. In yet other embodiments, Ring A iswhereinjs a pOint of attachment to PTM and ** is a point of attachment to L1.

[0347] In yet other embodiments of ULM-I-CRBN, Ring A iswhereinis a point of attachment to PTM and ** is a point of attachment to L1. In yet other embodiments of ULM-I-CRBN, Ring A is, whereinis a point of attachment to PTM and ** is a point of attachment to L1. In yet other embodiments of ULM- I-CRBN, Ring A iswhereinis a point of attachment to PTM and ** is a point of attachment to L1.

[0348] In yet other embodiments of ULM-I-CRBN, Ring A is a tricyclic heteroaryl having at least one N atom. In yet other embodiments of ULM-I-CRBN, Ring A is a carbazole, a pyrido-indole or a pyrrolo-dipyridine. In yet other embodiments of ULM-I-CRBN, Ring A iswhereinis a point of attachment to PTM and ** is a point of attachment to L1.

[0349] In yet other embodiments of ULM-I-CRBN, Ring A iswhereinis a point of attachment to PTM and ** is a point of attachment to L1.

[0350] In yet other embodiments of ULM-I-CRBN, Ring A iswhereinis a point of attachment to PTM and ** is a point of attachment to L1.

[0351] In some embodiments of ULM-I-CRBN, L1is a bond, -O-, -S-, -NRa-, -C(Ra)2-, or - C(O)NRa-. In some embodiments of ULM-I-CRBN, L1is a bond. In some embodiments of ULM-I-CRBN, L1is C1-C6alkylene. In some embodiments of ULM-I-CRBN, L1is - C(O)NRa-.

[0352] In some embodiments of ULM-I-CRBN, X1is a bond, -C(O)-, -C(S)-, -CH2-, - CHCF3-, SO2-, -S(O), P(O)Rb- or -P(O)ORb-. In some embodiments of ULM-I-CRBN, X1is a bond. In some embodiments of ULM-I-CRBN, X1is -C(O)-. In some embodiments of ULM-I-CRBN, X1is -CH2-. In some embodiments of ULM-I-CRBN, X1is -CHCF3-.

[0353] In some embodiments of ULM-I-CRBN, X2is -C(Ra)2-, -NRa- or -S-. In some embodiments, X2is -C(Ra)2-.

[0354] In some embodiments of ULM-I-CRBN, R2is H, deuterium, optionally substituted C1-4alkyl, C1-4alkoxyl, C1-4haloalkyl, -CN, -ORa, -ORbor -SRb. In some embodiments of ULM-I-CRBN, R2is H. In some embodiments of ULM-I-CRBN, R2is optionally substituted C1-4alkyl.

[0355] In some embodiments of ULM-I-CRBN, each R3is independently H, deuterium, halogen, oxo, -OH, -CN, -NO2, -C1-C6alkyl, -C2-C6alkenyl, -C2-C6alkynyl, C0-C1alk-aryl, C0- C1alk-heteroaryl, cycloalkyl, cycloalkenyl, heterocycloalkyl, or heterocycloalkenyl, -ORa, - SRa, -NRc2Rd, -NRaRc2, -C(O)Rb, -OC(O)Ra, -C(O)ORa, -C(O)NRc2Rd, -S(O)Rb, - S(O)2NRc2Rd, -S(O)(=NRb)Rb, -SF5, -P(O)RbRb, -P(O)(ORb)(ORb), -B(ORd)(ORc2) or - S(O)2Rb. In some embodiments of ULM-I-CRBN, at least one R3is H. In some embodiments of ULM-I-CRBN, each R3is H. In some embodiments of ULM-I-CRBN, at least one R3is C1-6alkyl.

[0356] In some embodiments of ULM-I-CRBN, each Rais independently H, deuterium, - C(O)Rb, -C(O)ORc2, -C(O)NRc2Rd, -C(=NRb)NRbRc2-C(=NORb)NRbRc2-C(=NCN)NRbRc2-P(ORc2)2, -P(O)Rc2Rb, -P(O)ORc2ORb, -S(O)Rb, -S(O)NRc2Rd, -S(O)2Rb, -S(O)2NRc2Rd, SiRb3, -C1-C10alkyl, -C2-C10alkenyl, -C2-C10alkynyl, aryl, cycloalkyl, cycloalkenyl, heteroaryl, heterocycloalkyl, or heterocycloalkenyl. In some embodiments of ULM-I-CRBN, Rais H. In some embodiments, Rais deuterium. In some embodiments, Rais -C(O)Rb. In some embodiments, Rais -C(O)ORc2. In some embodiments, Rais -C(O)NRc2Rd. In some embodiments, Rais -C(=NRb)NRbRc2. In some embodiments, Rais C(=NORb)NRbRc2. In some embodiments, Rais -C(=NCN)NRbRc2. In other embodiments, Rais -P(ORc2)2, - P(O)Rc2Rb, -P(O)ORc2ORb, -S(O)Rb, -S(O)NRc2Rd, -S(O)2Rb, -S(O)2NRc2Rd, SiRb3, and the like. In yet other embodiments, Rais -C1-C10alkyl, -C2-C10alkenyl, -C2-C10alkynyl, aryl, cycloalkyl, cycloalkenyl, heteroaryl, heterocycloalkyl, heterocycloalkenyl, and the like.

[0357] In some embodiments of ULM-I-CRBN, each Rb, is independently H, deuterium, -C1- C6alkyl, -C2-C6alkenyl, -C2-C6alkynyl, aryl, cycloalkyl, cycloalkenyl, heteroaryl, heterocycloalkyl, or heterocycloalkenyl. In some embodiments, Rbis H. In some embodiments, Rbis deuterium. In some embodiments, Rbis -C1-C6alkyl. In some embodiments, Rbis -C2-C6alkenyl. In some embodiments, Rbis -C2-C6alkynyl. In other embodiments, Rbis aryl. In other embodiments, Rbis cycloalkyl. In other embodiments, Rbis cycloalkenyl. In other embodiments, Rbis heteroaryl. In other embodiments, Rbis heterocycloalkyl. In other embodiments, Rbis heterocycloalkenyl.

[0358] In some embodiments of ULM-I-CRBN, each Rc2or Rdis independently H, deuterium, -C1-C10alkyl, -C2-C6alkenyl, -C2-C6alkynyl, -OC1-C6alkyl, -O-cycloalkyl, aryl, heteroaryl, cycloalkyl, cycloalkenyl, heterocycloalkyl, or heterocycloalkenyl. In some embodiments, Rc2or Rdis H. In some embodiments, Rc2or Rdis deuterium. In some embodiments, Rc2or Rdis -C1-C10alkyl. In some embodiments, Rc2or Rdis -C2-C6alkenyl. In some embodiments, Rc2or Rdis -C2-C6alkynyl. In other embodiments, Rc2or Rdis -OC1- C6alkyl. In other embodiments, Rc2or Rdis -O-cycloalkyl. In other embodiments, Rc2or Rdis aryl. In other embodiments, Rc2or Rdis cycloalkyl. In other embodiments, Rc2or Rdis cycloalkenyl. In other embodiments, Rc2or Rdis heteroaryl. In other embodiments, Rc2or Rdis heterocycloalkyl.

[0359] In other embodiments of ULM-I-CRBN, Rc2and Rd, together with the atom to which they are both attached, form a monocyclic or multicyclic heterocycloalkyl, or a monocyclic or multicyclic heterocyclo-alkenyl group. In other embodiments, Rc2or Rdis heterocycloalkenyl. In yet other embodiments, Rc2and Rd, together with the atom to whichthey are both attached, form a monocyclic or multicyclic heterocycloalkyl, or a monocyclic or multicyclic heterocyclo-alkenyl group. In yet other embodiments, Rc2and Rdform a monocyclic heterocycloalkyl. In yet other embodiments, Rc2and Rdform a multicyclic heterocycloalkyl. In yet other embodiments, Rc2and Rdform a monocyclic heterocycloalkenyl group. In yet other embodiments, Rc2and Rdform a multicyclic heterocyclo-alkenyl group.

[0360] In some embodiments of ULM-l-CRBN, o is 1, 2, 3, 4 or 5. In some embodiments, o is 1. In some embodiments, o is 2. In other embodiments, o is 3. In other embodiments, o is 4.In yet other embodiments, o is 5.

[0361] In some embodiments, ULM-I-CRBN is a compound of formula:wherein each X3is independently N, N-oxide or CR3and at least one X3is N or N-oxide; whereinis a point of attachment to PTM; orwherein each X3is independently N, N-oxide or CR3; wherein each Y1is independently -C(O)- or -C(Ra)2- and at least one Y1is -C(O)-; and wherein is a point of attachment to PTM; orwherein each X3is independently N, N-oxide or CR3and whereinis a point of attachment to PTM; orwherein each X3is independently N, N-oxide or CR3and whereinis a point of attachment to PTM.

[0362] In some embodiments of ULM-IA-CRBN, ULM-IB-CRBN, ULM-IC-CRBN, or ULM-ID-CRBN, X2is -C(Ra)2- and and R2is H.

[0363] In some embodiments, the degrader compounds of Formula I are those having the Formula IA-7-CRBN, Formula IA-8-CRBN, Formula IA-9-CRBN, Formula IA-10-CRBN, Formula IA-11-CRBN, Formula IA-12-CRBN or Formula IA-13-CRBN:wherein: each W is independently optionally substituted -CH2-, -C(O)-, -S(O)-, or -S(O)2-; wherein when n = 2 or 3, only one W may be -C(O)-, -S(O)-, or -S(O)2-, and the other W are -CH2- or substituted -CH2-; n = 0-3; m = 1-3;X is optionally substituted -CH2-, or NH; or, if R1is attached to X, then X is -CH- or N;Q is optionally substituted -CH2-, optionally substituted -(CH2)2-, -C(O)-, optionally substituted -CH2C(O)-, -S(O)-, -S(O)2-, optionally substituted -CH2S(O)2-, or optionally substituted -CH2S(O)-;Rc1and Rd1are independently H, deuterium, Halo, C1-3alkyl, C1-3haloalkyl, or C1-4alkoxyl;Re3is H, -C(O)Rf, -CH2-O-P(O)(ORg)2, or -P(O)(ORg)2; wherein Rfand Rgare independently H, C1-4alkyl, C1-4substituted alkyl, C3-8cyclcoalkyl, C3-8substituted cyclcoalkyl, C3-8heterocyclcoalkyl, or C3-8substituted heterocyclcoalkyl;R1is a covalent bond, 3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups, 3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups, -(CR1aR1b)1-5, -(CR1a=CR1b)-, -(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A-(CR1aR1b)1-5- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A- (CR1aR1b)1-5-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(CR1a=CR1b)-(CR1aR1b)1-5-, -(CR1aR1b)1-5-( CR1a=CR1b)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5- (C=C)-(CR1aR1b)1-5-, -(CR1aR1b)1-5-(C=C)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, -(C=C)-(CR1aR1b)1-5-A-(CR1aR1b)1-5- wherein A is O, S, or NR1c, -(C=C)-(CR1aR1b)1-5, -(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-, -(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-, -(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-, -(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups) -(CR1aR1b)1-5-, -(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-A-, - (CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-A-, -(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5, -(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5, -(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-A- wherein A is O, S, or NR1c, - (CR1aR1b)1-5-A-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A-wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein each A is independently O, S, or NR1c, -(CR1aR1b)1-5-A-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein each A is independently O, S, or NR1c, -(CR1aR1b)1-5-A-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A-(CR1aR1b)1-5-A- (CR1aR1b)1-5-A-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A-(CO) wherein A is O, S, or NR1c, -(CR1aR1b)1-5-( CR1a=CR1b)-(CR1aR1b)1-5-A-(CO)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(C=C)-(CR1aR1b)1-5-A-(CO)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A-(CO)- wherein A is O, S, or NR1c, - (CR1aR1b)1-5-A-(CO)-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- (CO)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A-(CO)-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A-(3-11 membered cycloalkyl optionally substituted with 0- 6 R1aand / or R1bgroups)-A-(CO)- wherein each A is independently O, S, or NR1c, -(3- 11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-CO- (CR1aR1b)1-5-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A-(CO)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A-(CO)- wherein A is O, S, or NR1c, -(3- 11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)- (CR1aR1b)1-5-, or -(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-; L1is a bond, -O-, -S-, -NRa-, -C(Ra)2-, or -C(O)NRa-;X1is a bond, -C(O)-, -C(S)-, -CH2-, -CHCF3-, SO2-, -S(O), P(O)Rb- or -P(O)ORb-;X2is -C(Ra)2-, -NRa- or -S-;R2is H, deuterium, optionally substituted C1-4alkyl, C1-4alkoxyl, C1-4haloalkyl, -CN, -ORa, -ORbor -SRb; each X3is independently N, N-oxide or CR3; and each Y is independently -C(O)- or -C(Ra)2- and at least one Y is -C(O)-.

[0364] In some embodiments of the degrader compound of Formula IA-7-CRBN, Formula IA-8-CRBN, Formula IA-9-CRBN, Formula IA-10-CRBN, Formula IA-11-CRBN, Formula IA-12-CRBN and Formula IA-13-CRBN, n = 1. In other embodiments of the degrader compound of Formula IA-7-CRBN, Formula IA-8-CRBN, Formula IA-9-CRBN, Formula IA-10-CRBN, Formula IA-11-CRBN, Formula IA-12-CRBN and Formula IA-13-CRBN, n = 2. In other embodiments of the degrader compound of Formula IA-7-CRBN, Formula IA-8- CRBN, Formula IA-9-CRBN, Formula IA-10-CRBN, Formula IA-11-CRBN, Formula IA- 12-CRBN and Formula IA-13-CRBN, n = 3.

[0365] In some embodiments of the degrader compound of Formula IA-7-CRBN, Formula IA-8-CRBN, Formula IA-9-CRBN, Formula IA-10, Formula IA-11-CRBN, Formula IA-12- CRBN and Formula IA-13-CRBN, m = 1. In other embodiments of the degrader compound of Formula IA-7-CRBN, Formula IA-8, Formula IA-9-CRBN, Formula IA-10-CRBN, Formula IA-11-CRBN, Formula IA-12-CRBN and Formula IA-13-CRBN, m = 2. In other embodiments of the degrader compound of Formula IA-7-CRBN, Formula IA-8-CRBN, Formula IA-9-CRBN, Formula IA-10-CRBN, Formula IA-11-CRBN, Formula IA-12-CRBN and Formula IA-13-CRBN, m = 3.

[0366] In some embodiments of the degrader compound of Formula IA-7-CRBN, Formula IA-8-CRBN, Formula IA-9-CRBN, Formula IA-10-CRBN, Formula IA-11-CRBN, Formula IA-12-CRBN and Formula IA-13-CRBN, Rc1and Rd1are each H.

[0367] In some embodiments of the degrader compound of Formula IA-7-CRBN, Formula IA-8-CRBN, Formula IA-9-CRBN, Formula IA-10-CRBN, Formula IA-11-CRBN, Formula IA-12-CRBN and Formula IA-13-CRBN, Re3is H.

[0368] In some embodiments of the degrader compound of Formula IA-7-CRBN, Formula IA-8-CRBN, Formula IA-9-CRBN, Formula IA-10-CRBN, Formula IA-11-CRBN, Formula IA-12-CRBN and Formula IA-13-CRBN, Rc1, Rd1, and Re3are each H.

[0369] In some embodiments, the degrader compounds of Formula I are those having the Formula IA-7a-CRBN, Formula IA-8a-CRBN, Formula IA-9a-CRBN, Formula lA-10a- CRBN, Formula IA-11a-CRBN, Formula IA-12a-CRBN or Formula IA-13 a-CRBN:wherein each Rkis independently H, deuterium, F, C1-3alkyl, C1-3haloalkyl, C1-4alkoxyl, substituted C1-3alkyl, substituted C1-3haloalkyl, or substituted C1-4alkoxyl; s is 0, 1, 2, 3 or 4; each Y1is independently -C(O)- or -CH2- and at least one Y1is -C(O)-; and Rd1, Rc1, R1, R2, X1, X2and X3are as defined herein.

[0370] In some embodiments of the degrader compounds of Formula IA-7a-CRBN, Formula IA-8a-CRBN, Formula IA-9a-CRBN, Formula IA-10a-CRBN, Formula IA-11a-CRBN, Formula IA-12a-CRBN and Formula IA-13a-CRBN, s is 0. In some embodiments of the degrader compounds of Formula IA-7a-CRBN, Formula IA-8a-CRBN, Formula IA-9a- CRBN, Formula lA-10a-CRBN, Formula IA-11a-CRBN, Formula IA-12a-CRBN andFormula IA-13a-CRBN, S is 1. In some embodiments of the degrader compounds of Formula IA-7a-CRBN, Formula IA-8a-CRBN, Formula IA-9a-CRBN, Formula lA-10a-CRBN, Formula IA-11a-CRBN, Formula IA-12a-CRBN and Formula IA-13a-CRBN, S is 2. In some embodiments of the degrader compounds of Formula IA-7a-CRBN, Formula IA-8a-CRBN, Formula IA-9a-CRBN, Formula lA-10a-CRBN, Formula IA-11a-CRBN, Formula IA-12a- CRBN and Formula IA-13a-CRBN, S is 3. In some embodiments of the degrader compounds of Formula IA-7a-CRBN, Formula IA-8a-CRBN, Formula IA-9a-CRBN, Formula lA-10a-CRBN, Formula IA-11a-CRBN, Formula IA-12a-CRBN and Formula IA- 13a-CRBN, S is 4.

[0371] In some embodiments of the degrader compounds of Formula IA-7a-CRBN, Formula IA-8a-CRBN, Formula IA-9a-CRBN, Formula lA-10a-CRBN, Formula IA-11a-CRBN, Formula IA-12a-CRBN and Formula IA-13a-CRBN, at least one Rkis H. In some embodiments of the degrader compounds of Formula IA-7a-CRBN, Formula IA-8a-CRBN, Formula IA-9a-CRBN, Formula lA-10a-CRBN, Formula IA-11a-CRBN, Formula IA-12a- CRBN and Formula IA-13a-CRBN, at least two Rkare H. In some embodiments of the degrader compounds of Formula IA-7a-CRBN, Formula IA-8a-CRBN, Formula IA-9a- CRBN, Formula lA-10a-CRBN, Formula IA-11a-CRBN, Formula IA-12a-CRBN and Formula IA-13a-CRBN, each Rkis H.

[0372] In some embodiments of the degrader compounds of Formula IA-7a-CRBN, Formula IA-8a-CRBN, Formula IA-9a-CRBN, Formula lA-10a-CRBN, Formula IA-11a-CRBN, Formula IA-12a-CRBN and Formula IA-13a-CRBN, at least one Rkis C1-6alkyl. In some embodiments of the degrader compounds of Formula IA-7a-CRBN, Formula IA-8a-CRBN, Formula IA-9a-CRBN, Formula lA-10a-CRBN, Formula IA-11a-CRBN, Formula IA-12a- CRBN and Formula IA-13a-CRBN, at least two Rkare C1-6alkyl. In some embodiments of the degrader compounds of Formula IA-7a-CRBN, Formula IA-8a-CRBN, Formula IA-9a- CRBN, Formula lA-10a-CRBN, Formula IA-11a-CRBN, Formula IA-12a-CRBN and Formula IA-13a-CRBN, each Rkis C1-6alkyl.

[0373] In some embodiments of the degrader compounds of Formula IA-7a-CRBN, Formula IA-8a-CRBN, Formula IA-9a-CRBN, Formula lA-10a-CRBN, Formula IA-11a-CRBN, Formula IA-12a-CRBN and Formula IA-13a-CRBN, at least one Rkis methyl. In some embodiments of the degrader compounds of Formula IA-7a-CRBN, Formula IA-8a-CRBN, Formula IA-9a-CRBN, Formula lA-10a-CRBN, Formula IA-11a-CRBN, Formula IA-12a- CRBN and Formula IA-13a-CRBN, at least two Rkare methyl. In some embodiments of the degrader compounds of Formula IA-7a-CRBN, Formula IA-8a-CRBN, Formula IA-9a-CRBN, Formula lA-10a-CRBN, Formula IA-11a-CRBN, Formula IA-12a-CRBN and Formula IA-13a-CRBN, each Rkis methyl.

[0374] In some embodiments of the degrader compounds of Formula IA-7a-CRBN, Formula IA-8a-CRBN, Formula IA-9a-CRBN, Formula lA-10a-CRBN, Formula IA-11a-CRBN, Formula IA-12a-CRBN and Formula IA-13a-CRBN, at least one Y1is -C(O)-. In some embodiments of the degrader compounds of Formula IA-7a-CRBN, Formula IA-8a-CRBN, Formula IA-9a-CRBN, Formula lA-10a-CRBN, Formula IA-11a-CRBN, Formula IA-12a- CRBN and Formula IA-13a-CRBN, each Y1is -C(O)-.

[0375] In some embodiments of the degrader compounds of Formula IA-7a-CRBN, Formula IA-8a-CRBN, Formula IA-9a-CRBN, Formula lA-10a-CRBN, Formula IA-11a-CRBN, Formula IA-12a-CRBN and Formula IA-13a-CRBN, at least one Y1is -CH2-. In some embodiments of the degrader compounds of Formula IA-7a-CRBN, Formula IA-8a-CRBN, Formula IA-9a-CRBN, Formula lA-10a-CRBN, Formula IA-11a-CRBN, Formula IA-12a- CRBN and Formula IA-13a-CRBN, each Y1is -CH2-.

[0376] In some embodiments of the degrader compounds of Formula IA-7a-CRBN, Formula IA-8a-CRBN, Formula IA-9a-CRBN, Formula lA-10a-CRBN, Formula IA-11a-CRBN, Formula IA-12a-CRBN and Formula IA-13a-CRBN-CRBN, one Y1is -CH2- and the other Y1is -C(O)-.

[0377] In some embodiments, the degrader compounds of Formula I are those having the Formula IA-7b-CRBN, Formula IA-8b-CRBN, Formula IA-9b-CRBN, Formula lA-10b- CRBN, Formula IA-11b-CRBN, Formula IA-12b-CRBN or Formula IA-13b-CRBN:wherein each Rkis independently H, deuterium, F, C1-3alkyl, C1-3haloalkyl, C1-4alkoxyl, substituted C1-3alkyl, substituted C1-3haloalkyl, or substituted C1-4alkoxyl; s is 0, 1, 2, 3 or 4; each Y1is independently -C(O)- or -CH2- and at least one Y1is -C(O)-; and Rd1, Rc1, R1and R3are as defined herein.

[0378] In some embodiments of the degrader compounds of Formula IA-7b-CRBN, Formula IA-8b-CRBN, Formula IA-9b-CRBN, Formula lA-10b-CRBN, Formula IA-11b-CRBN, Formula IA-12b-CRBN and Formula IA-13b-CRBN, s is 0. In some embodiments of the degrader compounds of Formula IA-7b-CRBN, Formula IA-8b-CRBN, Formula IA-9b- CRBN, Formula lA-10b-CRBN, Formula IA-11b-CRBN, Formula IA-12b-CRBN and Formula IA-13b-CRBN, s is 1. In some embodiments of the degrader compounds of Formula IA-7b-CRBN, Formula IA-8b-CRBN, Formula IA-9b-CRBN, Formula lA-10b-CRBN, Formula IA-11b-CRBN, Formula IA-12b-CRBN and Formula IA-13b-CRBN, s is 2. In some embodiments of the degrader compounds of Formula IA-7b-CRBN, Formula IA-8b- CRBN, Formula IA-9b-CRBN, Formula lA-10b-CRBN, Formula IA-11b-CRBN, Formula IA-12b-CRBN and Formula IA-13b-CRBN, s is 3. In some embodiments of the degrader compounds of Formula IA-7b-CRBN, Formula IA-8b-CRBN, Formula IA-9b-CRBN, Formula lA-10b-CRBN, Formula IA-11b-CRBN, Formula IA-12b-CRBN and Formula IA- 13b-CRBN, s is 4.

[0379] In some embodiments of the degrader compounds of Formula IA-7b-CRBN, Formula IA-8b-CRBN, Formula IA-9b-CRBN, Formula lA-10b-CRBN, Formula IA-11b-CRBN, Formula IA-12b-CRBN and Formula IA-13b-CRBN, at least one Rkis H. In some embodiments of the degrader compounds of Formula IA-7b-CRBN, Formula IA-8b-CRBN, Formula IA-9b-CRBN, Formula lA-10b-CRBN, Formula IA-11b-CRBN, Formula IA-12b- CRBN and Formula IA-13b-CRBN, at least two Rkare H. In some embodiments of thedegrader compounds of Formula IA-7b-CRBN, Formula IA-8b-CRBN, Formula IA-9b- CRBN, Formula lA-10b-CRBN, Formula IA-11b-CRBN, Formula IA-12b-CRBN and Formula IA-13b-CRBN, each Rkis H.

[0380] In some embodiments of the degrader compounds of Formula IA-7b-CRBN, Formula IA-8b-CRBN, Formula IA-9b-CRBN, Formula lA-10b-CRBN, Formula IA-11b-CRBN, Formula IA-12b-CRBN and Formula IA-13b-CRBN, at least one Rkis C1-6alkyl. In some embodiments of the degrader compounds of Formula IA-7b-CRBN, Formula IA-8b-CRBN, Formula IA-9b-CRBN, Formula lA-10b-CRBN, Formula IA-11b-CRBN, Formula IA-12b- CRBN and Formula IA-13b-CRBN, at least two Rkare C1-6alkyl. In some embodiments of the degrader compounds of Formula IA-7b-CRBN, Formula IA-8b-CRBN, Formula IA-9b- CRBN, Formula lA-10b-CRBN, Formula IA-11b-CRBN, Formula IA-12b-CRBN and Formula IA-13b-CRBN, each Rkis C1-6alkyl.

[0381] In some embodiments of the degrader compounds of Formula IA-7b-CRBN, Formula IA-8b-CRBN, Formula IA-9b-CRBN, Formula lA-10b-CRBN, Formula IA-11b-CRBN, Formula IA-12b-CRBN and Formula IA-13b-CRBN, at least one Rkis methyl. In some embodiments of the degrader compounds of Formula IA-7b-CRBN, Formula IA-8b-CRBN, Formula IA-9b-CRBN, Formula lA-10b-CRBN, Formula IA-11b-CRBN, Formula IA-12b- CRBN and Formula IA-13b-CRBN, at least two Rkare methyl. In some embodiments of the degrader compounds of Formula IA-7b-CRBN, Formula IA-8b-CRBN, Formula IA-9b- CRBN, Formula lA-10b-CRBN, Formula IA-11b-CRBN, Formula IA-12b-CRBN and Formula IA-13b-CRBN, each Rkis methyl.

[0382] In some embodiments of the degrader compounds of Formula IA-7b-CRBN, Formula IA-8b-CRBN, Formula IA-9b-CRBN, Formula lA-10b-CRBN, Formula IA-11b-CRBN, Formula IA-12b-CRBN and Formula IA-13b-CRBN, at least one Y1is -C(O)-. In some embodiments of the degrader compounds of Formula IA-7b-CRBN, Formula IA-8b-CRBN, Formula IA-9b-CRBN, Formula lA-10b-CRBN, Formula IA-11b-CRBN, Formula IA-12b- CRBN and Formula IA-13b-CRBN, each Y1is -C(O)-.

[0383] In some embodiments of the degrader compounds of Formula IA-7b-CRBN, Formula IA-8b-CRBN, Formula IA-9b-CRBN, Formula lA-10b-CRBN, Formula IA-11b-CRBN, Formula IA-12b-CRBN and Formula IA-13b-CRBN, at least one Y1is -CH2-. In some embodiments of the degrader compounds of Formula IA-7b-CRBN, Formula IA-8b-CRBN, Formula IA-9b-CRBN, Formula lA-10b-CRBN, Formula IA-11b-CRBN, Formula IA-12b- CRBN and Formula IA-13b-CRBN, each Y1is -CH2-.

[0384] In some embodiments of the degrader compounds of Formula IA-7b-CRBN, Formula IA-8b-CRBN, Formula IA-9b-CRBN, Formula IA-10b-CRBN, Formula IA-11b-CRBN, Formula IA-12b-CRBN and Formula IA-13b-CRBN, one Y1is -CH2- and the other Y1is - C(O)-.

[0385] In some embodiments, the degrader compounds of Formula I are those having the Formula IA-7c-CRBN, Formula IA-8c-CRBN, Formula IA-9c-CRBN, Formula IA-10C- CRBN, Formula IA-11c-CRBN, Formula IA-12c-CRBN or Formula IA-13c-CRBN:wherein each Rkis independently H, deuterium, F, C1-3alkyl, C1-3haloalkyl, C1-4alkoxyl, substituted C1-3alkyl, substituted C1-3haloalkyl, or substituted C1-4alkoxyl; s is 0, 1, 2, 3 or 4; each Y1is independently -C(O)- or -CH2- and at least one Y1is -C(O)-;A1is a bond, -(CR1R2)]n, -C=O, -C(=O)O, -C(=O)NR3, -SO2, -SO, aryl, heteroaryl, cycloalkyl, or heterocycloalkyl;A2is a bond, alkyl, cycloalkyl, heteroaryl or heterocycloalkyl;A3is a bond, -(CR1R2)]n, -C=O, -SO2, SO, aryl, heteroaryl, cycloalkyl or heterocycloalkyl;A4is a bond, alkyl, cycloalkyl, heteroaryl or heterocycloalkyl;wherein each of A1, A2, A3and A4is optionally substituted with deuterium, halo, alkyl, haloalkyl, -CN, -OR3, NRc2Rd, NO2, -SR3, -C=ORb, -C(=O)ORb, -C(=O)NR3R3, - SO2Rb, -SORb, -S(=O)(=NRb)N, cycloalkyl or heterocycloalkyl; and wherein two substituents on each A1, A2, A3, A4can be joined to form an additional 3- 8 membered ring, such as a spirocycle; andRd1, Rc1and R3are as defined herein.

[0386] In some embodiments of the degrader compounds of Formula IA-7c-CRBN, Formula IA-8c-CRBN, Formula IA-9c-CRBN, Formula IA-10C-CRBN, Formula IA-11c-CRBN, Formula IA-12c-CRBN or Formula IA-13c-CRBN, A1is a bond. In some embodiments of the degrader compounds of Formula IA-7c-CRBN, Formula IA-8c-CRBN, Formula IA-9c- CRBN, Formula IA-10c-CRBN, Formula IA-11c-CRBN, Formula IA-12c-CRBN or Formula IA-13c-CRBN, A1is -(CR1R2)]n. In some embodiments of the degrader compounds of Formula IA-7c-CRBN, Formula IA-8c-CRBN, Formula IA-9c-CRBN, Formula IA-10C- CRBN, Formula IA-11c-CRBN, Formula IA-12c-CRBN or Formula IA-13c-CRBN, A1is - C=O. In some embodiments of the degrader compounds of Formula IA-7c-CRBN, Formula IA-8c-CRBN, Formula IA-9c-CRBN, Formula IA-10C-CRBN, Formula IA-11c-CRBN, Formula IA-12c-CRBN or Formula IA-13c-CRBN, A1is-C(=O)O. In some embodiments of the degrader compounds of Formula IA-7c-CRBN, Formula IA-8c-CRBN, Formula IA-9c- CRBN, Formula IA-10c-CRBN, Formula IA-11c-CRBN, Formula IA-12c-CRBN or Formula IA-13c-CRBN, A1is -C(=O)NR3. In some embodiments of the degrader compounds of Formula IA-7c-CRBN, Formula IA-8c-CRBN, Formula IA-9c-CRBN, Formula IA-10C- CRBN, Formula IA-11c-CRBN, Formula IA-12c-CRBN or Formula IA-13c-CRBN, A1is - SO2. In some embodiments of the degrader compounds of Formula IA-7c-CRBN, Formula IA-8c-CRBN, Formula IA-9c-CRBN, Formula IA-10c-CRBN, Formula IA-11c-CRBN, Formula IA-12c-CRBN or Formula IA-13c-CRBN, A1is -SO. In some embodiments of the degrader compounds of Formula IA-7c-CRBN, Formula IA-8c-CRBN, Formula IA-9c- CRBN, Formula IA-10c-CRBN, Formula IA-11c-CRBN, Formula IA-12c-CRBN or Formula IA-13c-CRBN, A1is aryl. In some embodiments of the degrader compounds of Formula IA- 7c-CRBN, Formula IA-8c-CRBN, Formula IA-9c-CRBN, Formula IA-10c-CRBN, Formula IA-11c-CRBN, Formula IA-12c-CRBN or Formula IA-13c-CRBN, A1is heteroaryl. In some embodiments of the degrader compounds of Formula IA-7c-CRBN, Formula IA-8c-CRBN, Formula IA-9c-CRBN, Formula IA-10c-CRBN, Formula IA-11c-CRBN, Formula IA-12c- CRBN or Formula IA-13c-CRBN, A1is cycloalkyl. In some embodiments of the degrader compounds of Formula IA-7c-CRBN, Formula IA-8c-CRBN, Formula IA-9c-CRBN,Formula IA-10C-CRBN, Formula IA-11c-CRBN, Formula IA-12c-CRBN or Formula IA- 13c-CRBN, A1is heterocycloalkyl.

[0387] In some embodiments of the degrader compounds of Formula IA-7c-CRBN, Formula IA-8c-CRBN, Formula IA-9c-CRBN, Formula IA-10C-CRBN, Formula IA-11c-CRBN, Formula IA-12c-CRBN or Formula IA-13c-CRBN, A1is optionally substituted with deuterium, halo, alkyl, haloalkyl, -CN, -OR3, NRcRd, NO2, -SR3, -C=ORb, -C(=O)ORb, - C(=O)NR3R3, -SO2Rb, -SORb, -S(=O)(=NRb)N, cycloalkyl or heterocycloalkyl.

[0388] In some embodiments of the degrader compounds of Formula IA-7c-CRBN, Formula IA-8c-CRBN, Formula IA-9c-CRBN, Formula IA-10C-CRBN, Formula IA-11c-CRBN, Formula IA-12c-CRBN or Formula IA-13c-CRBN, A2is a bond. In some embodiments of the degrader compounds of Formula IA-7c-CRBN, Formula IA-8c-CRBN, Formula IA-9c- CRBN, Formula IA-10c-CRBN, Formula IA-11c-CRBN, Formula IA-12c-CRBN or Formula IA-13c-CRBN, A2is alkyl. In some embodiments of the degrader compounds of Formula IA-7c-CRBN, Formula IA-8c-CRBN, Formula IA-9c-CRBN, Formula IA-10c-CRBN, Formula IA-11c-CRBN, Formula IA-12c-CRBN or Formula IA-13c-CRBN, A2is heterocycloalkyl. In some embodiments of the degrader compounds of Formula IA-7c- CRBN, Formula IA-8c-CRBN, Formula IA-9c-CRBN, Formula IA-10c-CRBN, Formula IA- 1 Ic-CRBN, Formula IA-12c-CRBN or Formula IA-13c-CRBN, A2is heteroaryl. In some embodiments of the degrader compounds of Formula IA-7c-CRBN, Formula IA-8c-CRBN, Formula IA-9c-CRBN, Formula IA-10c-CRBN, Formula IA-11c-CRBN, Formula IA-12c- CRBN or Formula IA-13c-CRBN, A2is cycloalkyl. In some embodiments of the degrader compounds of Formula IA-7c-CRBN, Formula IA-8c-CRBN, Formula IA-9c-CRBN, Formula IA-10c-CRBN, Formula IA-11c-CRBN, Formula IA-12c-CRBN or Formula IA- 13c-CRBN, A2is heteroaryl.

[0389] In some embodiments of the degrader compounds of Formula IA-7c-CRBN, Formula IA-8c-CRBN, Formula IA-9c-CRBN, Formula IA-10c-CRBN, Formula IA-11c-CRBN, Formula IA-12c-CRBN or Formula IA-13c-CRBN, A2is optionally substituted with deuterium, halo, alkyl, haloalk...

Claims

CLAIMSWhat is claimed is:

1. An Antibody Drug Conjugate compound, or a pharmaceutically acceptable salt thereof, having the structure of:wherein,Ab is an antibody or an antigen-binding fragment thereof;L is a linker;D is a degrader compound of Formula (I):wherein, PTM is a moiety of Formula IA:wherein,R1is a covalent bond, or chemical moiety that links PTM and ULM;* is a point of attachment to ULM; n = 0-3; each W is independently optionally substituted -CH2-, -C(O)-, -S(O)-, or -S(O)2-, wherein when n = 2 or 3, only one W is -C(O)-, -S(O)-, or -S(O)2-, and the other W are -CH2- or substituted -CH2-;Rc1and Rd1are independently H, deuterium, Halo, C1-3alkyl, C1-3haloalkyl, or C1-4alkoxyl;Re3is hydrogen, -C(O)Rf, -CH2-O-P(O)(ORg)2, or -P(O)(ORg)2; wherein Rfand Rgare_independently H, C1-4alkyl, C1-4substituted alkyl, C3-8cyclcoalkyl, C3-8substituted cyclcoalkyl, C3-8heterocyclcoalkyl, or C3-8substituted heterocyclcoalkyl;Z and Y are each independently N; CRhwherein Rh= H, C1-3alkyl, orabsent; or, if R1is attached to Z, then Z is C and Y is N or CRhwherein Rhis H or C1-3alkyl; or if R1is attached to Y, then Y is C and Z is N or CRhwherein Rhis H or C1-3alkyl;B is an optionally substituted 5-7 membered cycloalkyl ring, an optionally substituted 5-7 membered heteroaryl ring, or an optionally substituted 5-7 membered heterocyclic ring, wherein ring B is fused to ring G through Y and Z;ULM is a small molecule E3 Ubiquitin Ligase binding moiety that binds a Von Hippel-Lindau E3 Ubiquitin Ligase or a Cereblon E3 Ubiquitin Ligase; and subscript z is an integer ranging from 1 to 14.

2. An Antibody Drug Conjugate compound, or a pharmaceutically acceptable salt thereof, of claim 1 having the structure of:wherein,Ab is an antibody or an antigen-binding fragment thereof;D is a degrader compound of Formula (I):wherein,PTM is a moiety of Formula IA:wherein,R1is a covalent bond, or chemical moiety that links PTM and ULM;* is a point of attachment to ULM; n = 0-3; each W is independently optionally substituted -CH2-, -C(O)-, -S(O)-,or -S(O)2-, wherein when n = 2 or 3, only one W is -C(O)-, -S(O)-, or -S(O)2-, and the other W are -CH2- or substituted -CH2-;Rc1and Rd1are independently H, deuterium, Halo, C1-3alkyl, C1-3haloalkyl, or C1-4alkoxyl;Re3is hydrogen, -C(O)Rf, -CH2-O-P(O)(ORg)2, or -P(O)(ORg)2; wherein Rfand Rgare_independently H, C1-4alkyl, C1-4substituted alkyl, C3-8cyclcoalkyl, C3-8substituted cyclcoalkyl, C3-8heterocyclcoalkyl, or C3-8substituted heterocyclcoalkyl;Z and Y are each independently N; CRhwherein Rh= H, C1-3alkyl, or absent; or, if R1is attached to Z, then Z is C and Y is N or CRhwherein Rhis H or C1-3alkyl; or if R1is attached to Y, then Y is C and Z is N or CRhwherein Rhis H or C1-3alkyl;B is an optionally substituted 5-7 membered cycloalkyl ring, an optionally substituted 5-7 membered heteroaryl ring, or an optionally substituted 5-7 membered heterocyclic ring, wherein ring B is fused to ring G through Y and Z;ULM is a small molecule E3 Ubiquitin Ligase binding moiety that binds a Von Hippel-Lindau E3 Ubiquitin Ligase or a Cereblon E3 Ubiquitin Ligase;L is a linker of Formula (II):wherein,M is selected from the group consisting of:whereinRb1and Rb2are each independently hydrogen or C1-C6alkyl, or Rb1and Rb2together with the carbon to which they are attached form a C4-C6cycloalkyl or a C4-C6heterocycloalkyl;Rb3and Rb4are each independently hydrogen or C1-C6alkyl, subscript si is 0 or 1, wherein the dashed line indicates the point of covalent attachment to the Ab and the wavy line indicates the point of covalent attachment to the remainder of the structure of L;U is absent or is-(CH2)b(Rv1)ss(C=O)u(NH)v- wherein subscript b is 0, 1, 2, 3, 4, or 5; subscript ss is 0 or 1; subscript u is 0 or 1; subscript v is 0 or 1;RV1is -C3-C6cycloalkyl- or -C3-C6cycloalkyl-C(O)NHCH2-Rv2-, wherein Rv2is C3-C6cycloalkyl, C3-C6heterocycle, or C3-C6heteroaryl; or -(CH2CH2O)wCH2CH2(NH)-, wherein subscript w is an integer ranging from 1 to 16;X is absent or is-(CH2CH2O)wCH2CH2-(C=O)d-, wherein subscript w is an integer ranging from 0 to 16 and subscript d is 0 or 1;-CH(Rx1)(CH2)nnC(O)-, wherein Rx1is hydrogen, -COOH, -C(O)NHCH3, or -(C(O)NHCH2)x(CH2OCH2)yRx2, wherein Rx2is -CH2NHC(O)CH3, - CH2NH2, or - CH2C(O)ORx2a, wherein Rx2ais hydrogen or C1-C6alkyl; subscript nn is an integer ranging from 1 to 6; subscript x and subscript y are each independently an integer ranging from 0 to 8;-C(O)-C(Rx3)(Rx4)-C(O)-, wherein Rx3and Rx4are independently hydrogen or C1-C6alkyl or Rx3and Rx4together with the carbon to which they are attached form a C3-C6cycloalkyl;-heterocycloalkyl-O(CH2)iC(O)-, wherein subscript i is an integer ranging from 0 to 6;-C(O)-C(Rx5)(Rx6)-, wherein Rx5is hydrogen or C1-C6alkyl and Rx6is hydrogen, C1-C6alkyl,, wherein subscript f is an integer ranging from 0 to 4 and each Rx7is independently hydrogen, -COOH, -NH2, C1-C6alkyl, or an independently selected side chain of an amino acid; or-(CH2CH2O)yyCH2CH2NHC(O)CH2OCH2C(O)-, wherein subscript yy is an integer ranging from 0 to 16;A A is absent or has the structure of:wherein subscript c is an integer ranging from 1 to 12; each Ra1is independently -COOH, -NH2, or an independently selected side chain of an amino acid;J is absent, -(Rj3)N(C(Rj1)(Rj2))m1-, or has the structure of:wherein Rj3is hydrogen, C1-C6alkyl, or C3-C6cycloalkyl; each Rj1and Rj2is independently hydrogen, C1-C6alkyl, C3-C6cycloalkyl, - OH, or -NRj4Rj5, wherein Rj4and Rj5are each -OH or C1-C6alkyl; subscript ml is an integer ranging from 1 to 6;each Rjis independently halogen, C1-C6alkyl, or -C(O)NH(C1-C6alkyl); subscript k is an integer ranging from 0 to 4;G is absent,wherein the wavy line to M of Formula (II) indicates the point of covalent attachment to Ab and the wavy line to G of Formula (II) indicates the point of covalent attachment to D, wherein subscript z is an integer ranging from 1 to 14.

3. An Antibody Drug Conjugate compound, or a pharmaceutically acceptable salt thereof, of claim 1 having the structure of:wherein,Ab is an antibody or an antigen-binding fragment thereof;D is a degrader compound of Formula (I):wherein,PTM is a moiety of Formula IA:wherein,R1is a covalent bond, or chemical moiety that links PTM and ULM;* is a point of attachment to ULM; n = 0-3; each W is independently optionally substituted -CH2-, -C(O)-, -S(O)-, or -S(O)2-, wherein when n = 2 or 3, only one W is -C(O)-, -S(O)-, or -S(O)2-, and the other W are -CH2- or substituted -CH2-;Rc1and Rd1are independently H, deuterium, Halo, C1-3alkyl, C1-3haloalkyl, or C1-4alkoxyl;Re3is hydrogen, -C(O)Rf, -CH2-O-P(O)(ORg)2, or -P(O)(ORg)2; wherein Rfand Rgare_independently H, C1-4alkyl, C1-4substituted alkyl, C3-8cyclcoalkyl, C3-8substituted cyclcoalkyl, C3-8heterocyclcoalkyl, or C3-8substituted heterocyclcoalkyl;Z and Y are each independently N; CRhwherein Rh= H, C1-3alkyl, or absent; or, if R1is attached to Z, then Z is C and Y is N or CRhwherein Rhis H or C1-3alkyl; or if R1is attached to Y, then Y is C and Z is N or CRhwherein Rhis H or C1-3alkyl;B is an optionally substituted 5-7 membered cycloalkyl ring, an optionally substituted 5-7 membered heteroaryl ring, or an optionally substituted 5-7 membered heterocyclic ring, wherein ring B is fused to ring G through Y and Z;ULM is a small molecule E3 Ubiquitin Ligase binding moiety that binds a Von Hippel-Lindau E3 Ubiquitin Ligase or a Cereblon E3 Ubiquitin Ligase;L is a linker of Formula (Ila):wherein,M is selected from the group consisting of:whereinRb1and Rb2are each independently hydrogen or C1-C6alkyl, or Rb1and Rb2together with the carbon to which they are attached form a C4-C6cycloalkyl or a C4-C6heterocycloalkyl;Rb3and Rb4are each independently hydrogen or C1-C6alkyl, subscript si is 0 or 1, wherein the dashed line indicates the point of covalent attachment to the Ab and the wavy line indicates the point of covalent attachment to the remainder of the structure of L’;U is absent or is -(CH2)b(Rv1)ss(C=O)u(NH)v- wherein subscript b is 0, 1, 2, 3, 4, or 5; subscript ss is 0 or 1; subscript u is 0 or 1; subscript v is 0 or 1;Rv1is -C3-C6cycloalkyl- or -C3-C6cycloalkyl-C(O)NHCH2-Rv2-, wherein Rv2is C3-C6cycloalkyl, C3-C6heterocycle, or C3-C6heteroaryl; or-(CH2CH2O)wCH2CH2(NH)-, wherein subscript w is an integer ranging from 1 to 16;X is absent or is-(CH2CH2O)wCH2CH2-(C=O)d-, wherein subscript w is an integer ranging from 0 to 16 and subscript d is 0 or 1;-CH(Rx1)(CH2)nnC(O)-, wherein Rx1is hydrogen, -COOH, -C(O)NHCH3, or -(C(O)NHCH2)x(CH2OCH2)yRx2, wherein Rx2is -CH2NHC(O)CH3, - CH2NH2, or - CH2C(O)ORx2a, wherein Rx2ais hydrogen or C1-C6alkyl; subscript nn is an integer ranging from 1 to 6; subscript x and subscript y are each independently an integer ranging from 0 to 8;-C(O)-C(Rx3)(Rx4)-C(O)-, wherein Rx3and Rx4are independently hydrogenor C1-C6alkyl or Rx3and Rx4together with the carbon to which they are attached form a C3-C6cycloalkyl;-heterocycloalkyl-O(CH2)iC(O)-, wherein subscript i is an integer ranging from 0 to 6;-C(O)-C(Rx5)(Rx6)-, wherein Rx5is hydrogen or C1-C6alkyl and Rx6is hydrogen, C1-C6alkyl,wherein subscript f is an integer ranging from 0 to 4 and each Rx7is independently hydrogen, -COOH, -NH2, C1-C6alkyl, C1-C6alkyl, or an independently selected side chain of an amino acid; or-(CH2CH2O)yyCH2CH2NHC(O)CH2OCH2C(O)-, wherein subscript yy is an integer ranging from 0 to 16;YY is a branching unit selected from the group consisting of:wherein each qq is independently -N(Ry1)- or -O-, wherein Ry1is hydrogen or C1-C6alkyl, one dashed line indicates the point of covalent attachment to EE when EE is present, or to AA when EE is absent, or to J when AA and EE are absent, or to G when A A, EE, and J are absent, and the other dashed line indicates the point of covalent attachment to NN, wherein the wavy line indicates the point of covalent attachment to X, when X is present, or to U, when X is absent, or to M, when X and U are absent;NN is -(CH2CH2O)k’CH2CH2C(O)-Rnn1-, wherein subscript k’ is an integer ranging from 0 to 16 and Rnn1is hydrogen, C1-C6alkyl, or -OH;EE is absent or -(CH2CH2O)XCH2CH2C(O)-, wherein subscript x’ is an integer ranging from 0 to 16;A A is absent or has the structure of:wherein subscript c is an integer ranging from 1 to 12; each Ra1is independently -COOH, -NH2, or an independently selected side chain of an amino acid;J is independently absent, -(Rj3)N(C(Rj1)(Rj2))m1-, or has the structure of:wherein Rj3is hydrogen, C1-C6alkyl, or C3-C6cycloalkyl; each Rj1and Rj2is independently hydrogen, C1-C6alkyl, C3-C6cycloalkyl, - OH, or -NRj4Rj5, wherein Rj4and Rj5are each -OH or C1-C6alkyl; subscript ml is an integer ranging from 1 to 6; each Rjis independently halogen, C1-C6alkyl, or -C(O)NH(C1-C6alkyl); subscript k is an integer ranging from 0 to 4;wherein the wavy line to M of Formula (Ila) indicates the point of covalent attachment to Ab and the wavy line to G of Formula (Ila) indicates the point of covalent attachment to D.

4. The Antibody Drug Conjugate compound of any one of the preceding claims, or a pharmaceutically acceptable salt thereof, wherein R1is a covalent bond.

5. The Antibody Drug Conjugate compound of any one of the preceding claims, or a pharmaceutically acceptable salt thereof, wherein R1is a chemical moiety represented by the formula:-(A)q-, wherein: q is an integer from 1 to 14; each A is independently selected from the group consisting of CR1aR1b, O, S, SO, SO2, NR1c, SO2NR1c, SONR1c, SO(=NR1c), SO(=NR1c)NR1d, CONR1c, NR1cCONR1d, NR1cC(O)O, NR1cSO2NR1d, CO, CR1a=CR1b, C=C, SiR1aR1b, P(O)R1a, P(O)OR1a, (CR1aR1b)1-4, -(CR1aR1b)1-4O(CR1aR1b)1-4, -(CR1aR1b)1-4S(CR1aR1b)1-4, - (CR1aR1b)1-4NR(CR1aR1b)1-4,NR1cC(=NCN)NR1dNR1cC(=NCN), NR1cC(=CNO2)NR1d, 3-11 membered cycloalkyl, optionally substituted with 0-6 R1aand / or R1bgroups, 3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups, aryl optionally substituted with 0-6 R1aand / or R1bgroups, and heteroaryl optionally substituted with 0-6 R1aand / or R1bgroups, wherein R1a, R1b, R1c, R1dand R1eare each independently, -H, deuterium, - halo, -C1-C8alkyl, -O-C1-C8alkyl, -C1-C6haloalkyl, -S-C1-C8alkyl,-NHC1-C8alkyl, - N(C1-C8alkyl)2, 3-11 membered cycloalkyl, aryl, heteroaryl, 3-11 membered heterocyclyl, -O-(3-11 membered cycloalkyl), -S-(3-11 membered cycloalkyl), NH- (3-11 membered cycloalkyl), N(3-11 membered cycloalkyl)2, N-(3-11 membered cycloalkyl)(C1-C8alkyl), -OH, -NH2, -SH, -SO2C1-C8alkyl, SO(NH)C1-C8alkyl, P(O)(OC1-C8alkyl)(C1-C8alkyl), -P(O)(OC1-C8alkyl)2, -C=C-C1-C8alkyl, -C=CH, - CH=CH(C1-C8alkyl), -C(C1-C8alkyl)=CH(C1-C8alkyl), -C(C1-C8alkyl)=C(C1- C8alkyl)2, -Si(OH)3, -Si(C1-C8alkyl)3, -Si(OH)(C1-C8alkyl)2, -C(O)C1-C8alkyl, - CO2H, -CN, -CF3, -CHF2, -CH2F, -NO2, -SF5, -SO2NHC1-C8alkyl, -SO2N(CI- C8alkyl)2, -SO(NH)NHC1-C8alkyl, -SO(NH)N(C1-C8alkyl)2, -SONHC1-C8alkyl, - SON(C1-C8alkyl)2, -CONHC1-C8alkyl, -CON(C1-C8alkyl)2, -N(C1- C8alkyl)CONH(C1-C8alkyl), -N(C1-C8alkyl)CON(C1-C8alkyl)2, -NHCONH(C1- C8alkyl), -NHCON(C1-C8alkyl)2, -NHC0NH2, -N(C1-C8alkyl)SO2NH(C1-C8alkyl), - N(C1-C8alkyl)SO2N(C1-C8alkyl)2, -NHSO2NH(C1-C8alkyl), -NHSO2N(C1-C8alkyl)2, or -NHSO2NH2; and where R1aor R1b, each independently may be optionally linked to other groups to form cycloalkyl and / or heterocyclyl moiety, optionally substituted with 0-4 R1egroups.

6. The Antibody Drug Conjugate compound of any one of the preceding claims, or a pharmaceutically acceptable salt thereof, wherein ULM binds Von Hippel -Lindau E3 Ubiquitin Ligase.

7. The Antibody Drug Conjugate compound of claim 6, or a pharmaceutically acceptable salt thereof, wherein ULM is a moiety having the Formula ULM-I-VHL-1 :wherein the dashed line ( ---- ) indicates the position of attachment of ULM-I-VHL-1 to R1;R15is hydrogen or -PO3H2;V is H or F;R3is optionally substituted phenyl, optionally substituted napthyl, or an optionally substituted 5-10 membered heteroaryl; one of R4or R5is H, deuterium, haloalkyl, optionally substituted alkyl, optionally substituted cycloalkyl, optionally substituted heterocycloalkyl, or -CORdv, CONRe1Re2; the other of R4or R5is H or deuterium; or R4and R5, together with the carbon atom to which they are both attached, form an optionally substituted 3-5 membered cycloalkyl or heterocyclyl;W3is an optionally substituted aryl, optionally substituted heteroaryl, orR6and R7are independently H, deuterium, optionally substituted alkyl, optionally substituted cycloalkyl, or optionally substituted haloalkyl, or R6, R7, and the carbon atom to which they are attached form an optionally substituted cycloalkyl or optionally substituted heterocyclyl;R8is an optionally substituted heterocyclyl, optionally substituted heteroaryl, optionally substituted aryl, CONRavRbv, NRavRbv,Ravis H or optionally substituted alkyl;Rbvis H, -C(O)-* wherein * is a point of attachment to R1, optionally substituted alkyl, optionally substituted alkylcarbonyl, optionally substituted (cycloalkyl)alkylcarbonyl, optionally substituted aralkylcarbonyl, optionally substituted arylcarbonyl, optionally substituted (cycloalkyl)carbonyl, optionally substituted (heterocyclyl) carbonyl, or optionally substituted aralkyl; each Rcis independently H, halo, optionally substituted alkoxy, cyano, optionally substituted alkyl, haloalkyl, or haloalkoxy; each Rdvis independently H, optionally substituted alkyl or NRe1Re2; each Re1and Re2is independently H, deuterium, or optionally substituted alkyl, or Re1and Re2together with the nitrogen atom to which they are attached form a 4-7 membered heterocyclyl; and p is 0, 1, 2, 3, or 4.

8. The Antibody Drug Conjugate compound of claim 6 or 7, or a pharmaceutically acceptable salt thereof, wherein ULM-I-VHL-1 is a compound of formula:wherein * is a point of attachment of the ULM to R1.

9. The Antibody Drug Conjugate compound of any one of claims 6 to 8, or a pharmaceutically acceptable salt thereof, wherein D has a structure of:whereinW is optionally substituted -CH2-, -C(O)-, -S(O)-, or -S(O)2-; wherein when n = 2 or 3, only one W may be -C(O)-, -S(O)-, or -S(O)2-; n = 0-3; m = 1-3;Rk= H, deuterium, F, C1-3alkyl, C1-3haloalkyl, or C1-4alkoxyl; s = 0-3;Rc1and Rd1are independently H, deuterium, Halo, C1-3alkyl, C1-3haloalkyl, or C1-4alkoxyl;Re3is H, -C(O)Rf, or -P(O)(0Rg)2; wherein Rfand Rgare independently H, C1-4alkyl, C1-4substituted alkyl, C3-8cyclcoalkyl, C3-8substituted cyclcoalkyl, C3-8heterocyclcoalkyl, or C3-8substituted heterocyclcoalkyl;R1is a covalent bond, 3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups, 3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups, -(CR1aR1b)1-5, -(CR1a=CR1b)-, -(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, - (CR1aR1b)1-5-A-(CR1aR1b)1-5- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(CR1a=CR1b)-(CR1aR1b)1-5-, -(CR1aR1b)1-5-( CR1a=CR1b)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(C=C)-(CR1aR1b)1-5-, - (CR1aR1b)1-5-(C=C)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, -(C=C)-(CR1aR1b)1-5-A- (CR1aR1b)1-5- wherein A is O, S, or NR1c, -(C=C)-(CR1aR1b)1-5, -(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-, -(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-, -(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-, - (3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups) - (CR1aR1b)1-5-, -(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-A-, -(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-A-, -(CR1aR1b)1-5-(3-l l membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5, -(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5, -(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A-(3-11 membered heterocyclyl optionally substituted with 0- 6 R1aand / or R1bgroups)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein each A is independently O, S, or NR1c, -(CR1aR1b)1-5-A-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein each A is independently O, S, or NR1c, -(CR1aR1b)1-5-A-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, - (CR1aR1b)1-5-A-(CR1aR1b)1-5-A-(CR1aR1b)1-5-A-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, - (CR1aR1b)1-5-A-(CO) wherein A is O, S, or NR1c, -(CR1aR1b)1-5-( CR1a=CR1b)-(CR1aR1b)1-5-A- (CO)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(C=C)-(CR1aR1b)1-5-A-(CO)- wherein A is O,S, or NR1c, -(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A-(CO)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A-(CO)- (3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A-(CO)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A- (CO)-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-A-(CO)- wherein each A is independently O, S, or NR1c, -(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)- CO-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A-(CO)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A-(CO)- wherein A is O, S, or NR1c, -(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-, or -(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-; or R1is -(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)- (CO)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c; -(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CO)-A-(CR1aR1b)1-5- wherein A is O, S, or NR1c; -A-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)- (CR1aR1b)1-5-A- wherein each A is independently O, S, or NR1c; -(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5- A- wherein A is O, S, or NR1c; -(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c; -(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-A-(CR1aR1b)1-5-A- wherein each A is independently O, S, or NR1c; -(heteroaryl optionally substituted with 0-4 R1aand / or R1bgroups)-A-(CR1aR1b)1-5- wherein A is O, S, or NR1c; -(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c; -(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CO)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c; -(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CO)-A-(CR1aR1b)1-5- wherein A is O, S, or NR1c; or -(CO)-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c;R4is H, optionally substituted alkyl, optionally substituted C1-C6alkyl, or -CH3;R7is optionally substituted alkyl, preferably optionally substituted C1-C6alkyl, and more preferably C1-C6alkyl; andR9is H, deuterium, halo, -CN, -OH, -NO2, -NRe1Re2, -ORe1, -CONRe1Re2, - NRe1CORe2, -SO2NRe1Re2, -NRe1SO2Re2, optionally substituted alkyl, optionally substituted alkoxyl, optionally substituted haloalkyl, optionally substituted haloalkoxy; optionally substituted aryl; optionally substituted heteroaryl; optionally substituted cycloalkyl; or optionally substituted heterocyclyl;R1a, R1b, R1c, and R1eare each independently, -H, deuterium, -halo, -C1-C8alkyl, -C1- C6haloalkyl, -O-C1-C8alkyl, -S-C1-C8alkyl, -NHC1-C8alkyl, -N(C1-C8alkyl)2, 3-11 membered cycloalkyl, aryl, heteroaryl, 3-11 membered heterocyclyl, -O-(3-11 membered cycloalkyl), - S-(3-11 membered cycloalkyl), NH-(3-11 membered cycloalkyl), N(3-11 membered cycloalkyl)2, N-(3-11 membered cycloalkyl)(C1-C8alkyl), -OH, -NH2, -SH, -SO2C1-C8alkyl, SO(NH)C1-C8alkyl, P(O)(OC1-C8alkyl)(C1-C8alkyl), -P(O)(OC1-C8alkyl)2, -C=C-C1-C8alkyl, -C=CH, -CH=CH(C1-C8alkyl), -C(C1-C8alkyl)=CH(C1-C8alkyl), -C(C1-C8alkyl)=C(C1- C8alkyl)2, -Si(OH)3, -Si(C1-C8alkyl)3, -Si(OH)(C1-C8alkyl)2, -C(O)C1-C8alkyl, -CO2H, -CN, - CF3, -CHF2, -CH2F, -NO2, -SF5, -SO2NHC1-C8alkyl, -SO2N(C1-C8alkyl)2, -SO(NH)NHC1- C8alkyl, -SO(NH)N(C1-C8alkyl)2, -SONHC1-C8alkyl, -SON(C1-C8alkyl)2, -CONHC1-C8alkyl, -CON(C1-C8alkyl)2, -N(C1-C8alkyl)CONH(C1-C8alkyl), -N(C1-C8alkyl)CON(C1-C8alkyl)2, - NHCONH(C1-C8alkyl), -NHCON(C1-C8alkyl)2, -NHCONH2, -N(C1-C8alkyl)SO2NH(C1- C8alkyl), -N(C1-C8alkyl)SO2N(C1-C8alkyl)2, -NHSO2NH(C1-C8alkyl), -NHSO2N(C1- C8alkyl)2, or -NHSO2NH2; or where the context permits, R1aor R1b, are linked to other groups, or to each other, to form a cycloalkyl and / or a heterocyclyl moiety, optionally substituted with 0-4 R1egroups; and each Re1and Re2is independently H, deuterium, or optionally substituted alkyl, or Re1and Re2together with the nitrogen atom to which they are attached form a 4-7 membered heterocyclyl.

10. The Antibody Drug Conjugate compound of any one of claims 6 to 9, or a pharmaceutically acceptable salt thereof, wherein D has a structure of:wherein the wavy line indicates the point of covalent attachment to L.

11. The Antibody Drug Conjugate compound of any one of claims 6 to 9, or a pharmaceutically acceptable salt thereof, wherein D has a structure ofwherein the wavy line indicates the point of covalent attachment to L.

12. The Antibody Drug Conjugate compound of any one of claims 6 to 9, or a pharmaceutically acceptable salt thereof, wherein D has a structure ofwherein the wavy line indicates the point of covalent attachment to L.

13. The Antibody Drug Conjugate compound of claim 6 or 7, or a pharmaceutically acceptable salt thereof, wherein D has a structure of:wherein R15is hydrogen or-PO3H2and the wavy line indicates the point of covalent attachment to L.

14. The Antibody Drug Conjugate compound of claim 13, or a pharmaceutically acceptable salt thereof, wherein D has a structure of:

15. The Antibody Drug Conjugate compound of any one of claims 1 to 14, or a pharmaceutically acceptable salt thereof, wherein ULM binds Cereblon E3 Ubiquitin Ligase.

16. The Antibody Drug Conjugate compound of claim 15, or a pharmaceutically acceptable salt thereof, wherein ULM is a moiety having the Formula ULM-II-CRBN:whereinis a point of attachment to PTM;Ring A is a monocyclic, bicyclic or tricyclic aryl, heteroaryl or heterocycle group, L1is a bond, -O-, -S-, -NRa-, -C(Ra)2-, or -C(O)NRa-;X1is a bond, -C(O)-, -C(S)-, -CH2-, -CHCF3-, SO2-, -S(O), P(O)Rb- or -P(O)ORb-;X2is -C(Ra)2-, -NRa- or -S-;R2is H, deuterium, optionally substituted C1-4alkyl, C1-4alkoxyl, C1-4haloalkyl, -CN, -ORa, -ORbor -SRb;each R3is independently H, deuterium, halogen, oxo, -OH, -CN, -NO2, -C1-C6alkyl, - C2-C6alkenyl, -C2-C6alkynyl, C0-C1alk-aryl, C0-C1alk-heteroaryl, cycloalkyl, cycloalkenyl, heterocycloalkyl, or heterocycloalkenyl, -ORa, -SRa, -NRc2Rd, -NRaRc2, -C(O)Rb, -OC(O)Ra, -C(O)ORa, -C(O)NRc2Rd, -S(O)Rb, -S(O)2NRc2Rd, -S(O)(=NRb)Rb, -SF5, -P(O)RbRb, - P(O)(ORb)(ORb), -B(ORd)(ORc2) or -S(O)2Rb; each Rais independently H, deuterium, -C(O)Rb, -C(O)ORc2, -C(O)NRc2Rd, - C(=NRb)NRbRc2-C(=NORb)NRbRc2-C(=NCN)NRbRc2-P(ORc2)2, -P(O)Rc2Rb, - P(O)ORc2ORb, -S(O)Rb, -S(O)NRc2Rd, -S(O)2Rb, -S(O)2NRc2Rd, SiRb3, -C1-C10alkyl, -C2-C10alkenyl, -C2-C10alkynyl, aryl, cycloalkyl, cycloalkenyl, heteroaryl, heterocycloalkyl, or heterocycloalkenyl; each Rb, is independently H, deuterium, -C1-C6alkyl, -C2-C6alkenyl, -C2-C6alkynyl, aryl, cycloalkyl, cycloalkenyl, heteroaryl, heterocycloalkyl, or heterocycloalkenyl; each Rc2or Rdis independently H, deuterium, -C1-C10alkyl, -C2-C6alkenyl, -C2-C6alkynyl, -OC1-C6alkyl, -O-cycloalkyl, aryl, heteroaryl, cycloalkyl, cycloalkenyl, heterocycloalkyl, or heterocycloalkenyl; orRc2and Rd, together with the atom to which they are both attached, form a monocyclic or multicyclic heterocycloalkyl, or a monocyclic or multicyclic heterocyclo-alkenyl group; and o is 1, 2, 3, 4, or 5.

17. The Antibody Drug Conjugate compound of claim 15 or 16, or a pharmaceutically acceptable salt thereof, wherein ULM-II-CRBN is a compound of formula:wherein each X3is independently N, N-oxide or CR3and at least one X3is N or N- oxide; whereinis a point of attachment to PTM; orwherein each X3is independently N, N-oxide or CR3;wherein each Y1is independently -C(O)- or -C(Ra)2- and at least one Y1is -C(O)-; and whereinis a point of attachment to PTM; orwherein each X3is independently N, N-oxide or CR3and whereinis a point of attachment to PTM; orwherein each X3is independently N, N-oxide or CR3and whereinis a point of attachment to PTM.

18. The Antibody Drug Conjugate compound of any one of claims 15 to 17, or a pharmaceutically acceptable salt thereof, wherein D has a structure of:wherein the wavy line indicates the point of covalent attachment to L;Rhis C1-3alkyl;R1ais hydrogen, C1-3alkyl, or halogen;Zc1and Zc2are each independently CH or N; and U1is -CH2- or -C(O)-.

19. The Antibody Drug Conjugate compound of claim 18, or a pharmaceutically acceptable salt thereof, wherein D has a structure of:the wavy line indicates the point of covalent attachment to L;Rhis methyl or ethyl; andR1ais hydrogen, methyl, or fluorine.

20. The Antibody Drug Conjugate compound of claim 19, or a pharmaceutically acceptable salt thereof, wherein D has a structure of:wherein the wavy line indicates the point of attachment to L.

21. The Antibody Drug Conjugate compound of any one of the preceding claims, or a pharmaceutically acceptable salt thereof, having the formula of:

22. The Antibody Drug Conjugate compound of any one of the preceding claims, or a pharmaceutically acceptable salt thereof, whereinAA is present; subscript c is an integer ranging between 1 and 12; and each Ra1is independently -COOH, -NH2, or an independently selected side chain of an amino acid, wherein each amino acid is selected from the group consisting of alanine, valine, glutamic acid, citrulline, tryptophan, glycine, phenylalanine, and lysine.

23. The Antibody Drug Conjugate compound of claim 21 or 22, or a pharmaceutically acceptable salt thereof, represented by the structure of:whereinS is a sulfur atom of the Ab; subscript b is an integer ranging from 1 to 5; subscript c is an integer ranging from 1 to 5; each Ra1is independently the side chain of valine, glutamic acid, tryptophan, glycine, citrulline, lysine, alanine, or phenylalanine; each Rjis independently fluorine, chlorine, methyl, or -C(O)NHCH3; and subscript k is an integer ranging from 0 to 4.

24. The Antibody Drug Conjugate compound of claim 22, or a pharmaceutically acceptable salt thereof, represented by the structure of:wherein Rjis methyl, -F, -Cl, or -C(O)NHCH3, and subscript k is 0 or 1.

25. The Antibody Drug Conjugate compound of claim 22, or a pharmaceutically acceptable salt thereof, represented by the structure of:

26. The Antibody Drug Conjugate compound of claim 25, or a pharmaceutically acceptable salt thereof, represented by the structure of:

27. The Antibody Drug Conjugate compound of claim 21 or 22, or a pharmaceutically acceptable salt thereof, represented by the structure of:whereinS is a sulfur atom of the Ab; subscript b is an integer ranging from 1 to 5; subscript w is an integer ranging from 1 to 8; subscript c is an integer ranging from 1 to 3; each Ra1is independently the side chain of valine, glutamic acid, tryptophan, glycine, citrulline, lysine, alanine, or phenylalanine; each Rjis independently fluorine, chlorine, methyl, or -C(O)NHCH3; and subscript k is an integer ranging from 0 to 4.

28. The Antibody Drug Conjugate compound of claim 27, or a pharmaceutically acceptable salt thereof, represented by the structure of:

29. The Antibody Drug Conjugate compound of claim 21 or 22, or a pharmaceuticallyacceptable salt thereof, represented by the structure of:whereinS is a sulfur atom of the Ab; subscript b is an integer ranging from 1 to 5; subscript c is an integer ranging from 1 to 3;Rx1is hydrogen, -COOH, -C(O)NHCH3, or -(C(O)NHCH2)x(CH2OCH2)yRx2, wherein Rx2is -CH2NHC(O)CH3, - CH2NH2, or - CH2C(O)ORx2a, wherein Rx2ais hydrogen or C1-C6alkyl; each Ra1is independently the side chain of valine, glutamic acid, tryptophan, glycine, citrulline, lysine, alanine, or phenylalanine; each Rjis independently fluorine, chlorine, methyl, or -C(O)NHCH3; and subscript k is an integer ranging from 0 to 4.

30. The Antibody Drug Conjugate compound of claim 29, or a pharmaceutically acceptable salt thereof, represented by the structure of:

31. The Antibody Drug Conjugate compound of claim 29 or 30, or a pharmaceutically acceptable salt thereof, wherein Rx1is32. The Antibody Drug Conjugate compound of claim 21 or 22, or a pharmaceutically acceptable salt thereof, represented by the structure of:whereinS is a sulfur atom of the Ab; subscript b is an integer ranging from 1 to 5; subscript c is 1 or 2; each Ra1is independently the side chain of valine or citrulline; each Rjis independently fluorine, chlorine, methyl, or -C(O)NHCH3; and subscript k is an integer ranging from 0 to 4.

33. The Antibody Drug Conjugate compound of claim 32, or a pharmaceutically acceptable salt thereof, represented by the structure of:

34. The Antibody Drug Conjugate compound of claim 33, or a pharmaceutically acceptable salt thereof, represented by the structure of:

35. The Antibody Drug Conjugate compound of claim 21 or 22, or a pharmaceutically acceptable salt thereof, represented by the structure of:whereinS is a sulfur atom of the Ab; subscript b is an integer ranging from 1 to 5; subscript c is 1 or 2; each Ra1is independently the side chain of valine or citrulline; each Rjis independently fluorine, chlorine, methyl, or -C(O)NHCH3; and subscript k is an integer ranging from 0 to 4.

36. The Antibody Drug Conjugate compound of claim 35, or a pharmaceutically acceptable salt thereof, represented by the structure of:

37. The Antibody Drug Conjugate compound of claim 36, or a pharmaceutically acceptable salt thereof, represented by the structure of:

38. The Antibody Drug Conjugate compound of claim 21 or 22, or a pharmaceutically acceptable salt thereof, represented by the structure of:whereinS is a sulfur atom of the Ab; subscript c is an integer ranging from 1 to 4; each Ra1is independently the side chain of valine or citrulline; each Rjis independently fluorine, chlorine, methyl, or -C(O)NHCH3; and subscript k is an integer ranging from 0 to 4.

39. The Antibody Drug Conjugate compound of claim 38, or a pharmaceutically acceptable salt thereof, represented by the structure of:

40. The Antibody Drug Conjugate compound of claim 21 or 22, or a pharmaceutically acceptable salt thereof, represented by the structure of:whereinS is a sulfur atom of the Ab; subscript c is an integer ranging from 1 to 4; each Ra1is independently the side chain of valine or citrulline; each Rjis independently fluorine, chlorine, methyl, or -C(O)NHCH3; and subscript k is an integer ranging from 0 to 4.

41. The Antibody Drug Conjugate compound of claim 40, or a pharmaceutically acceptable salt thereof, represented by the structure of:

42. The Antibody Drug Conjugate compound of claim 21 or 22, or a pharmaceutically acceptable salt thereof, represented by the structure of:

43. The Antibody Drug Conjugate compound of claim 41, or a pharmaceuticallyacceptable salt thereof, represented by the structure of:

44. The Antibody Drug Conjugate compound of claim 21 or 22, or a pharmaceutically acceptable salt thereof, represented by the structure of:wherein subscript b is an integer ranging from 1 to 5;Rx5is hydrogen or C1-C6alkyl; andRx6is hydrogen, C1-C6alkyl,wherein subscript f is an integer ranging from 0 to 4 and each Rx7is independently hydrogen, C1-C6alkyl, or an independently selected side chain of an amino acid.

45. The Antibody Drug Conjugate compound of claim 44, or a pharmaceutically acceptable salt thereof, represented by the structure of:wherein Rx6iswherein subscript f is an integer ranging from0 to 4 and each Rx7is independently hydrogen, C1-C6alkyl, or an independently selected side chain of an amino acid.

46. The Antibody Drug Conjugate compound of claim 45, or a pharmaceutically acceptable salt thereof, wherein Rx6is47. The Antibody Drug Conjugate compound of claim 21 or 22, or a pharmaceutically acceptable salt thereof, represented by the structure of:wherein E is -CH2- or -O-.

48. The Antibody Drug Conjugate compound of claim 21 or 22, or a pharmaceutically acceptable salt thereof, represented by the structure of:whereinE is -CH2- or -O-;Rhis methyl or ethyl; andR1ais hydrogen, methyl, or fluorine.

49. The Antibody Drug Conjugate compound of claim 21 or 22, or a pharmaceutically acceptable salt thereof, represented by the structure of:wherein subscript w is an integer ranging from 1 to 8; Rjis methyl, -F, -Cl, or - C(O)NHCH3; and subscript k is 0 or 1.

50. The Antibody Drug Conjugate compound of claim 21 or 22, or a pharmaceutically acceptable salt thereof, represented by the structure of:

51. The Antibody Drug Conjugate compound of claim 21 or 22, or a pharmaceutically acceptable salt thereof, represented by the structure of:whereinRb1and Rb2are each independently hydrogen, C1-C6alkyl, or both Rb1and Rb2, together with the carbon to which they are attached, comprise a C4-C6cycloalkyl or a C4-C6heterocycloalkyl;Rb3and Rb4are each independently hydrogen or C1-C6alkyl; subscript si is 0 or 1; andU, X, and AA are each absent.

52. The Antibody Drug Conjugate compound of claim 51, or a pharmaceutically acceptable salt thereof, represented by the structure of:wherein T is absent or is -CH2CH2- ; K is -CH2- or -NH2-.

53. The Antibody Drug Conjugate compound of claim 51 or 52, or a pharmaceutically acceptable salt thereof, represented by the structure of:

54. The Antibody Drug Conjugate compound of claim 51, or a pharmaceutically acceptable salt thereof, represented by the structure of:

55. The Antibody Drug Conjugate compound of claim 6 or 7, or a pharmaceutically acceptable salt thereof, represented by the structure of:wherein S is a sulfur atom of the Ab and R15is hydrogen or -PO3H2.

56. The Antibody Drug Conjugate compound of claim 55, or a pharmaceutically acceptable salt thereof, represented by the structure of:whereinS is a sulfur of the Ab; subscript c is an integer ranging between 1 and 4; subscript w is an integer ranging between 1 and 8; and U is absent or is -CH2-(C=O)-(NH)-.

57. The Antibody Drug Conjugate compound of claim 6 or 7, or a pharmaceutically acceptable salt thereof, represented by the structure of:wherein S is a sulfur of the Ab and R15is hydrogen or -PO3H2.

58. The Antibody Drug Conjugate compound of claim 57, or a pharmaceutically acceptable salt thereof, represented by the structure of:whereinS is a sulfur of the Ab; subscript c is an integer ranging between 1 and 4; andU is -(CH2CH2O)wCH2CH2(NH)-, wherein subscript w is an integer ranging between 1 and 4.

59. An Antibody Drug Conjugate compound, or a pharmaceutically acceptable salt thereof, having the structure of:wherein,Ab is an antibody or an antigen-binding fragment thereof;L is a linker;D is a degrader compound of Formula (I):wherein,PTM is a moiety of Formula IA:wherein,R1is a covalent bond, or chemical moiety that links PTM and ULM;* is a point of attachment to ULM; n = 0-3; each W is independently optionally substituted -CH2-, -C(O)-, -S(O)-, or -S(O)2-, wherein when n = 2 or 3, only one W is -C(O)-, -S(O)-, or -S(O)2-, and the other W are -CH2- or substituted -CH2-;Rc1and Rd1are independently H, deuterium, Halo, C1-3alkyl, C1-3haloalkyl, or C1-4alkoxyl;Re3is hydrogen, -C(O)Rf, -CH2-O-P(O)(ORg)2, or -P(O)(ORg)2; wherein Rfand Rgare_independently H, C1-4alkyl, C1-4substituted alkyl, C3-8cyclcoalkyl, C3-8substituted cyclcoalkyl, C3-8heterocyclcoalkyl, or C3-8substituted heterocyclcoalkyl;Z and Y are each independently N; CRhwherein Rh= H, C1-3alkyl, or absent; or, if R1is attached to Z, then Z is C and Y is N or CRhwherein Rhis H or C1-3alkyl; or if R1is attached to Y, then Y is C and Z is N or CRhwherein Rhis H or C1-3alkyl;B is an optionally substituted 5-7 membered cycloalkyl ring, an optionally substituted 5-7 membered heteroaryl ring, or an optionally substituted 5-7 membered heterocyclic ring, wherein ring B is fused to ring G through Y and Z;ULM is a small molecule E3 Ubiquitin Ligase binding moiety that binds a Von Hippel-Lindau E3 Ubiquitin Ligase or a Cereblon E3 Ubiquitin Ligase; and subscript z is an integer ranging from 1 to 14.

60. The Antibody Drug Conjugate compound of claim 59, or a pharmaceutically acceptable salt thereof, wherein L is a linker of Formula (III):wherein,M is selected from the group consisting of:whereinRb1and Rb2are each independently hydrogen or C1-C6alkyl, or Rb1and Rb2together with the carbon to which they are attached form a C4-C6cycloalkyl or a C4-C6heterocycloalkyl;Rb3and Rb4are each independently hydrogen or C1-C6alkyl, subscript si is 0 or 1, wherein the dashed line indicates the point of covalent attachment to the Ab and the wavy line indicates the point of covalent attachment to the remainder of the structure of L;U is absent or is -(CH2)b(Rv1)ss(C=O)u(NH)v- wherein subscript b is 0, 1, 2, 3, 4, or 5; subscript ss is 0 or 1; subscript u is 0 or 1; subscript v is 0 or 1;Rv1is -C3-C6cycloalkyl- or -C3-C6cycloalkyl-C(O)NHCH2-Rv2-, wherein Rv2is C3-C6cycloalkyl, C3-C6heterocycle, or C3-C6heteroaryl; or-(CH2CH2O)wCH2CH2(NH)-, wherein subscript w is an integer ranging from 1 to 16;X is absent or is-(CH2CH2O)wCH2CH2-(C=O)d-, wherein subscript w is an integer ranging from 0 to 16 and subscript d is 0 or 1;-CH(Rx1)(CH2)nnC(O)-, wherein Rx1is hydrogen, -COOH, - C(O)NHCH3, or -(C(O)NHCH2)x(CH2OCH2)yRx2, wherein Rx2is - CH2NHC(O)CH3, - CH2NH2, or - CH2C(O)ORx2a, wherein Rx2ais hydrogen or C1-C6alkyl; subscript nn is an integer ranging from 1 to 6; subscript x and subscript y are each independently an integer ranging from 0 to 8;-C(O)-C(Rx3)(Rx4)-C(O)-, wherein Rx3and Rx4are independentlyhydrogen or C1-C6alkyl or Rx3and Rx4together with the carbon to which they are attached form a C3-C6cycloalkyl;-heterocycloalkyl-O(CH2)iC(O)-, wherein subscript i is an integer ranging from 0 to 6;-C(O)-C(Rx5)(Rx6)-OC(O)-, wherein Rx5is hydrogen or C1-C6alkyl and Rx6is hydrogen, C1-C6alkyl,wherein subscript f is an integer ranging from 0 to 4, and each Rx7is independently hydrogen, -COOH, -NH2, C1-C6alkyl, or an independently selected side chain of an amino acid; or-(CH2CH2O)yyCH2CH2NHC(O)CH2OCH2C(O)-, wherein subscript yy is an integer ranging from 0 to 16;YY is a branching unit selected from the group consisting of:wherein each qq is independently -N(Ry1)- or -O-, wherein Ry1is hydrogen or C1-C6alkyl; the wavy line indicates the point of attachment to X, when present, or U, when X is absent, or M, when X and U are absent; and each dashed line indicates the point of attachment to ZZ when ZZ is present, or to AA when ZZ is absent, or to J when AA and ZZ are absent, or to G when AA, ZZ, and J are absent; each ZZ is independently -(CH2CH2O)wCH2CH2C(O)-, wherein subscript w’ is an integer ranging from 0 to 16; each AA is independently absent or has the structure of:wherein subscript c is an integer ranging from 1 to 12; each Ra1is independently -COOH, -NH2, or an independently selected side chain of an amino acid; each J is independently absent, -(Rj3)N(C(Rj1)(Rj2))m1, or has the structure of.wherein Rj3is hydrogen, C1-C6alkyl, or C3-C6cycloalkyl; each Rj1and Rj2is independently hydrogen, C1-C6alkyl, C3-C6cycloalkyl, - OH, or -NRj4Rj5, wherein Rj4and Rj5are each -OH or C1-C6alkyl; subscript ml is an integer ranging from 1 to 6; each Rjis independently halogen, C1-C6alkyl, or -C(O)NH(C1-C6alkyl); subscript k is an integer ranging from 0 to 4; each G is independently absent,wherein the wavy line to M of Formula (III) indicates the point of covalent attachment to Ab and the wavy line to each G of Formula (III) indicates the point of covalent attachment to D, wherein subscript z is an integer ranging from 1 to 14.

61. The Antibody Drug Conjugate compound of claim 59 or 60, or a pharmaceutically acceptable salt thereof, wherein L has the structure of:

62. The Antibody Drug Conjugate compound of any one of claims 59 to 61, or a pharmaceutically acceptable salt thereof, wherein L has the structure of:whereinU is absent or is -(CH2)b(Rv1)ss(C=O)u(NH)v-, wherein subscript b is 0, 1, 2, 3, 4, or 5; subscript ss is 0 or 1; subscript u is 0 or 1; subscript v is 0 or 1; Rv1is -C3-C6cycloalkyl- or -C3-C6cycloalkyl-C(O)NHCH2-Rv2-, wherein Rv2is C3-C6cycloalkyl, C3-C6heterocycle, or C3-C6heteroaryl;X is absent or is -(CH2CH2O)wCH2CH2-(C=O)d-, wherein subscript w is an integer ranging from 0 to 8 and subscript d is 0 or 1; subscript c is an integer ranging from 1 to 12 and each Ra1is independently -COOH, -NH2, or an independently selected side chain of an amino acid, wherein each amino acid is selected from the group consisting of alanine,valine, citrulline, glutamic acid, tryptophan, glycine, phenylalanine, and lysine; each Rjis independently fluorine, chlorine, methyl, or -C(O)NHCH3; and subscript k is an integer ranging from 0 to 4.

63. An Antibody Drug Conjugate compound of claim 59, or a pharmaceutically acceptable salt thereof, wherein L is a linker of Formula (lib):wherein, subscript dd is 2; M is selected from the group consisting of:whereinRb1and Rb2are each independently hydrogen or C1-C6alkyl, or Rb1and Rb2together with the carbon to which they are attached form a C4-C6cycloalkyl or a C4-C6heterocycloalkyl;Rb3and Rb4are each independently hydrogen or C1-C6alkyl, subscript si is 0 or 1, wherein the dashed line indicates the point of covalent attachment to the Ab and the wavy line indicates the point of covalent attachment to the remainder of thestructure of L;U is absent or is -(CH2)b(Rv1)ss(C=O)u(NH)v- wherein subscript b is 0, 1, 2, 3, 4, or 5; subscript ss is 0 or 1; subscript u is 0 or 1; subscript v is 0 or 1;Rv1is -C3-C6cycloalkyl- or -C3-C6cycloalkyl-C(O)NHCH2-Rv2-, whereinRv2is C3-C6cycloalkyl, C3-C6heterocycle, or C3-C6heteroaryl; or-(CH2CH2O)wCH2CH2(NH)-, wherein subscript w is an integer ranging from 1 to 16;X is absent or is-(CH2CH2O)wCH2CH2-(C=O)d-, wherein subscript w is an integer ranging from 0 to 16 and subscript d is 0 or 1;-CH(Rx1)(CH2)nnC(O)-, wherein Rx1is hydrogen, -COOH, -C(O)NHCH3, or -(C(O)NHCH2)x(CH2OCH2)yRx2, wherein Rx2is -CH2NHC(O)CH3, - CH2NH2, or - CH2C(O)ORx2a, wherein Rx2ais hydrogen or C1-C6alkyl; subscript nn is an integer ranging from 1 to 6; subscript x and subscript y are each independently an integer ranging from 0 to 8;-C(O)-C(Rx3)(Rx4)-C(O)-, wherein Rx3and Rx4are independently hydrogen or C1-C6alkyl or Rx3and Rx4together with the carbon to which they are attached form a C3-C6cycloalkyl;-heterocycloalkyl-O(CH2)iC(O)-, wherein subscript i is an integer ranging from 0 to 6;-C(O)-C(Rx5)(Rx6)-, wherein Rx5is hydrogen or C1-C6alkyl and Rx6is hydrogen, C1-C6alkyl,, wherein subscript f is an integer ranging from 0 to 4 and each Rx7is independently hydrogen, -COOH, -NH2, C1-C6alkyl, C1-C6alkyl, or an independently selected side chain of an amino acid; or-(CH2CH2O)yyCH2CH2NHC(O)CH2OCH2C(O)-, wherein subscript yy is an integer ranging from 0 to 16;YY is a branching unit having the structure of:wherein qq1and qq2are each independently -N(Ry1)- or -O-, wherein Ry1is hydrogen or C1-C6alkyl, and the wavy line of YY indicates the point of attachment to X, when present, or to U when X is absent, or to M when X and U are absent; and the dashed lines of YY indicate the point of attachment to EE when EE is present, or to A A when EE is absent, or to J when AA and EE are absent, or to G when AA, EE, and J are absent, and to NN;NN is -(CH2CH2O)k’CH2CH2C(O)-Rnn1-, wherein subscript k’ is an integer ranging from 0 to 16 and Rnn1is hydrogen, C1-C6alkyl, or -OH; each EE is independently absent or -(CH2CH2O)XCH2CH2C(O)-, wherein subscript x’ is an integer ranging from 0 to 16; each AA is independently absent or has the structure of:wherein subscript c is an integer ranging from 1 to 12; each Ra1is independently -COOH, -NH2, or an independently selected side chain of an amino acid; each J is independently absent, -(Rj3)N(C(Rj1)(Rj2))m1, or has the structure of.wherein Rj3is hydrogen, C1-C6alkyl, or C3-C6cycloalkyl; each Rj1and Rj2is independently hydrogen, C1-C6alkyl, C3-C6cycloalkyl, - OH, or -NRj4Rj5, wherein Rj4and Rj5are each -OH or C1-C6alkyl; subscript ml is an integer ranging from 1 to 6; each Rjis independently halogen, C1-C6alkyl, or -C(O)NH(C1-C6alkyl); subscript k is an integer ranging from 0 to 4; each G is independently absent,and wherein the wavy line to M of Formula (lib) indicates the point of covalent attachment to Ab and the wavy line to G of Formula (lib) indicates the point of covalent attachment to an independently selected D.

64. The Antibody Drug Conjugate compound of claim 63, or a pharmaceutically acceptable salt thereof, wherein L has the structure of:wherein qq1and qq2are each independently -N(Ry1)- or -O-, wherein Ry1is hydrogen or C1-C6alkyl.

65. The Antibody Drug Conjugate compound of any one of claims 1 to 64, or a pharmaceutically acceptable salt thereof, wherein z is an integer ranging from 2 to 8.

66. The Antibody Drug Conjugate compound of any one of claims 1 to 65, or a pharmaceutically acceptable salt thereof, wherein z is 4.

67. The Antibody Drug Conjugate compound of any one of claims 1 to 66, or a pharmaceutically acceptable salt thereof, wherein z is 6.

68. The Antibody Drug Conjugate compound of any one of claims 1 to 67, or a pharmaceutically acceptable salt thereof, wherein Ab binds to prostate-specific membrane antigen (PSMA).

69. The Antibody Drug Conjugate compound of any one of claims 1 to 68, or a pharmaceutically acceptable salt thereof, wherein Ab is an anti-PSMA antibody.

70. The Antibody Drug Conjugate compound of any one of claims 1 to 67, or a pharmaceutically acceptable salt thereof, wherein Ab binds to CD33 antigen.

71. The Antibody Drug Conjugate compound of claim 70, or a pharmaceutically acceptable salt thereof, wherein Ab is an anti-CD33 antibody.

72. A pharmaceutical composition comprising an Antibody Drug Conjugate compound of any one of claims 1 to 71, or claims 135 or 136, and at least one pharmaceutically acceptable excipient.

73. A method of treating cancer in a subject in need thereof comprising administering to the subject an effective amount of an Antibody Drug Conjugate compound of any one of claims 1 to 71, or claims 135 or 136, or a pharmaceutically acceptable salt thereof, or a pharmaceutical composition of claim 72.

74. The method of claim 73, wherein the cancer is prostate cancer or acute myeloid leukemia (AML).

75. A Degrader-Linker compound, or a pharmaceutically acceptable salt or solvate thereof, having the structure of:wherein,L’ is a linker precursor; andD is a degrader compound of Formula (I):wherein, PTM is a moiety of Formula IA:wherein,R1is a covalent bond, or chemical moiety that links PTM and ULM;* is a point of attachment to ULM; n = 0-3; each W is independently optionally substituted -CH2-, -C(O)-, -S(O)-, or -S(O)2-, wherein when n = 2 or 3, only one W is -C(O)-, -S(O)-, or -S(O)2-, and the other W are -CH2- or substituted -CH2-;Rc1and Rd1are independently H, deuterium, Halo, C1-3alkyl, C1-3haloalkyl, or C1-4alkoxyl;Re3is hydrogen, -C(O)Rf, -CH2-O-P(O)(ORg)2, or -P(O)(ORg)2; wherein Rfand Rgare_independently H, C1-4alkyl, C1-4substituted alkyl, C3-8cyclcoalkyl, C3-8substituted cyclcoalkyl, C3-8heterocyclcoalkyl, or C3-8substituted heterocyclcoalkyl;Z and Y are each independently N; CRhwherein Rh= H, C1-3alkyl, or absent; or, if R1is attached to Z, then Z is C and Y is N or CRhwherein Rhis H or C1-3alkyl; or if R1is attached to Y, then Y is C and Z is N or CRhwherein Rhis H or C1-3alkyl;B is an optionally substituted 5-7 membered cycloalkyl ring, an optionally substituted 5-7 membered heteroaryl ring, or an optionally substituted 5-7 membered heterocyclic ring, wherein ring B is fused to ring Gthrough Y and Z; andULM is a small molecule E3 Ubiquitin Ligase binding moiety that binds a Von Hippel-Lindau E3 Ubiquitin Ligase or a Cereblon E3 Ubiquitin Ligase.

76. A Degrader-Linker compound, or a pharmaceutically acceptable salt or solvate thereof, having the structure of:wherein,D is a degrader compound of Formula (i):wherein,PTM is a moiety of Formula ia:wherein,R1is a covalent bond, or chemical moiety that links PTM and ULM;* is a point of attachment to ULM; n = 0-3; each W is independently optionally substituted -CH2-, -C(O)-, -S(O)-, or -S(O)2-, wherein when n = 2 or 3, only one W is -C(O)-, -S(O)-, or -S(O)2-, and the other W are -CH2- or substituted -CH2-;Rc1and Rd1are independently H, deuterium, Halo, C1-3alkyl, C1-3haloalkyl, or C1-4alkoxyl;Re3is hydrogen, -C(O)Rf, -CH2-O-P(O)(ORg)2, or -P(O)(ORg)2; wherein Rfand Rgare_independently H, C1-4alkyl, C1-4substituted alkyl, C3-8cyclcoalkyl, C3-8substituted cyclcoalkyl, C3-8heterocyclcoalkyl, or C3-8substituted heterocyclcoalkyl;Z and Y are each independently N; CRhwherein Rh= H, or C1-3alkyl, absent; or, if R1is attached to Z, then Z is C and Y is N or CRhwherein RhisH or C1-3alkyl; or if R1is attached to Y, then Y is C and Z is N or CRhwherein Rhis H or C1-3alkyl;B is an optionally substituted 5-7 membered cycloalkyl ring, an optionally substituted 5-7 membered heteroaryl ring, or an optionally substituted 5-7 membered heterocyclic ring, wherein ring B is fused to ring G through Y and Z;ULM is a small molecule E3 Ubiquitin Ligase binding moiety that binds a Von Hippel-Lindau E3 Ubiquitin Ligase or a Cereblon E3 Ubiquitin Ligase;L’ is a linker precursor of Formula (ii):whereinM’ is selected from the group consisting of:wherein each Rm1and Rm2is independently hydrogen, halogen, or -S-Ph;Rm3and Rm4are each halogen;Rb1and Rb2are each independently hydrogen or C1-C6alkyl, or Rb1and Rb2together with the carbon to which they are attached form a C4-C6cycloalkyl or a C4-C6heterocycloalkyl;Rb3and Rb4are each independently hydrogen or C1-C6alkyl, subscript si is 0 or 1;wherein the wavy line indicates the point of covalent attachment to the remainder of the structure of L’;U is absent or is -(CH2)b(Rv1)ss(C=O)u(NH)v- wherein subscript b is 0, 1, 2, 3, 4, or 5; subscript ss is 0 or 1; subscript u is 0 or 1; subscript v is 0 or 1;Rv1is -C3-C6cycloalkyl- or -C3-C6cycloalkyl-C(O)NHCH2-Rv2-, whereinRv2is C3-C6cycloalkyl, C3-C6heterocycle, or C3-C6heteroaryl; or -(CH2CH2O)wCH2CH2(NH)-, wherein subscript w is an integer ranging from1 to 16;X is absent or is-(CH2CH2O)wCH2CH2-(C=O)d- wherein subscript w is an integer ranging from 0 to 16 and subscript d is 0 or 1;-CH(Rx1)(CH2)nnC(O)-, wherein Rx1is hydrogen, -COOH, -C(O)NHCH3, or -(C(O)NHCH2)x(CH2OCH2)yRx2, wherein Rx2is -CH2NHC(O)CH3, - CH2NH2, or - CH2C(O)ORx2a, wherein Rx2ais hydrogen or C1-C6alkyl; subscript nn is an integer ranging from 1 to 6; subscript x and subscript y are each independently an integer ranging from 0 to 8;-C(O)-C(Rx3)(Rx4)-C(O)-, wherein Rx3and Rx4are independently hydrogen or C1-C6alkyl or Rx3and Rx4together with the carbon to which they are attached form a C3-C6cycloalkyl;-heterocycloalkyl-O(CH2)iC(O)-, wherein subscript i is an integer ranging from 0 to 6;-C(O)-C(Rx5)(Rx6)-, wherein Rx5is hydrogen or C1-C6alkyl and Rx6is hydrogen, C1-C6alkyl,wherein subscript f is an integer ranging from 0 to 4 and each Rx7is independently hydrogen, -COOH, -NH2, C1-C6alkyl, or an independently selected side chain of an amino acid; or-(CH2CH2O)yyCH2CH2NHC(O)CH2OCH2C(O)-, wherein subscript yy is aninteger ranging from 0 to 16;A A is absent or has the structure of:wherein subscript c is an integer ranging from 1 to 12; each Ra1is independently -COOH, -NH2, or an independently selected side chain of an amino acid;J is absent, -(Rj3)N(C(Rj1)(Rj2))m1-, or has the structure of:wherein Rj3is hydrogen, C1-C6alkyl, or C3-C6cycloalkyl; each Rj1and Rj2is independently hydrogen, C1-C6alkyl, C3-C6cycloalkyl, - OH, or -NRj4Rj5, wherein Rj4and Rj5are each -OH or C1-C6alkyl; subscript ml is an integer ranging from 1 to 6; each Rjis independently halogen, C1-C6alkyl, or -C(O)NH(C1-C6alkyl); subscript k is an integer ranging from 0 to 4;G is absent,wherein the wavy line to G in Formula (ii) indicates the point of covalent attachment to D.

77. A Degrader-Linker compound, or a pharmaceutically acceptable salt or solvate thereof, having the structure of:wherein,D is a degrader compound of Formula (i):wherein, PTM is a moiety of Formula ia:wherein,R1is a covalent bond, or chemical moiety that links PTM and ULM;* is a point of attachment to ULM; n = 0-3; each W is independently optionally substituted -CH2-, -C(O)-, -S(O)-, or -S(O)2-, wherein when n = 2 or 3, only one W is -C(O)-, -S(O)-, or -S(O)2-, and the other W are -CH2- or substituted -CH2-;Rc1and Rd1are independently H, deuterium, Halo, C1-3alkyl, C1-3haloalkyl, or C1-4alkoxyl;Re3is hydrogen, -C(O)Rf, -CH2-O-P(O)(ORg)2, or -P(O)(ORg)2; wherein Rfand Rgare_independently H, C1-4alkyl, C1-4substituted alkyl, C3-8cyclcoalkyl, C3-8substituted cyclcoalkyl, C3-8heterocyclcoalkyl, or C3-8substituted heterocyclcoalkyl;Z and Y are each independently N; CRhwherein Rh= H, or C1-3alkyl, absent; or, if R1is attached to Z, then Z is C and Y is N or CRhwherein Rhis H or C1-3alkyl; or if R1is attached to Y, then Y is C and Z is N or CRhwherein Rhis H or C1-3alkyl;B is an optionally substituted 5-7 membered cycloalkyl ring, an optionally substituted 5-7 membered heteroaryl ring, or an optionally substituted 5-7 membered heterocyclic ring, wherein ring B is fused to ring G through Y and Z;ULM is a small molecule E3 Ubiquitin Ligase binding moiety that binds a Von Hippel-Lindau E3 Ubiquitin Ligase or a Cereblon E3 Ubiquitin Ligase;L’ is a linker precursor of Formula (iia):whereinM’ is selected from the group consisting of:wherein each Rm1and Rm2is independently hydrogen, halogen, or -S-Ph;Rm3and Rm4are each halogen;Rb1and Rb2are each independently hydrogen or C1-C6alkyl, or Rb1and Rb2together with the carbon to which they are attached form a C4-C6cycloalkyl or a C4-C6heterocycloalkyl;Rb3and Rb4are each independently hydrogen or C1-C6alkyl, subscript si is 0 or 1; wherein the wavy line indicates the point of covalent attachment to the remainder of the structure of L’;U is absent or is -(CH2)b(Rv1)ss(C=O)u(NH)v- wherein subscript b is 0, 1, 2, 3, 4, or 5; subscript ss is 0 or 1; subscript u is 0 or 1;subscript v is 0 or 1;Rv1is -C3-C6cycloalkyl- or -C3-C6cycloalkyl-C(O)NHCH2-Rv2-, whereinRv2is C3-C6cycloalkyl, C3-C6heterocycle, or C3-C6heteroaryl; or-(CH2CH2O)wCH2CH2(NH)-, wherein subscript w is an integer ranging from 1 to 16;X is absent or is-(CH2CH2O)wCH2CH2-(C=O)d- wherein subscript w is an integer ranging from 0 to 16 and subscript d is 0 or 1;-CH(Rx1)(CH2)nnC(O)-, wherein Rx1is hydrogen, -COOH, -C(O)NHCH3, or -(C(O)NHCH2)x(CH2OCH2)yRx2, wherein Rx2is -CH2NHC(O)CH3, - CH2NH2, or - CH2C(O)ORx2a, wherein Rx2ais hydrogen or C1-C6alkyl; subscript nn is an integer ranging from 1 to 6; subscript x and subscript y are each independently an integer ranging from 0 to 8;-C(O)-C(Rx3)(Rx4)-C(O)-, wherein Rx3and Rx4are independently hydrogen or C1-C6alkyl or Rx3and Rx4together with the carbon to which they are attached form a C3-C6cycloalkyl;-heterocycloalkyl-O(CH2)iC(O)-, wherein subscript i is an integer ranging from 0 to 6;-C(O)-C(Rx5)(Rx6)-, wherein Rx5is hydrogen or C1-C6alkyl and Rx6is hydrogen, C1-C6alkyl,, wherein subscript f is an integer ranging from 0 to 4 and each Rx7is independently hydrogen, -COOH, -NH2, C1-C6alkyl, or an independently selected side chain of an amino acid; or-(CH2CH2O)yyCH2CH2NHC(O)CH2OCH2C(O)-, wherein subscript yy is an integer ranging from 0 to 16;YY is a branching unit selected from the group consisting of:wherein each qq is independently -N(Ry1)- or -O-, wherein Ry1is hydrogen or C1-C6alkyl, one dashed line indicates the point of covalent attachment to EE when EE is present, or to AA when EE is absent, or to J when AA and EE are absent, or to G when A A, EE, and J are absent, and the other dashed line indicates the point of covalent attachment to NN, wherein the wavy line indicates the point of covalent attachment to X, when X is present, or to U, when X is absent, or to M, when X and U are absent;NN is -(CH2CH2O)k’CH2CH2C(O)-Rnn1-, wherein subscript k’ is an integer ranging from 0 to 16 and Rnn1is hydrogen, C1-C6alkyl, or -OH;EE is absent or -(CH2CH2O)XCH2CH2C(O)-, wherein subscript x’ is an integer ranging from 0 to 16;A A is absent or has the structure of:wherein subscript c is an integer ranging from 1 to 12; each Ra1is independently -COOH, -NH2, or an independently selected side chain of an amino acid;J is independently absent, -(Rj3)N(C(Rj1)(Rj2))m1-, or has the structure of:wherein Rj3is hydrogen, C1-C6alkyl, or C3-C6cycloalkyl;each Rj1and Rj2is independently hydrogen, C1-C6alkyl, C3-C6cycloalkyl, - OH, or -NRj4Rj5, wherein Rj4and Rj5are each -OH or C1-C6alkyl; subscript ml is an integer ranging from 1 to 6; each Rjis independently halogen, C1-C6alkyl, or -C(O)NH(C1-C6alkyl); subscript k is an integer ranging from 0 to 4;G is absent,wherein the wavy line to G in Formula (iia) indicates the point of covalent attachment to D.

78. The Degrader-Linker compound of claim 76 or 77, or a pharmaceutically acceptable salt thereof, wherein R1is a covalent bond.

79. The Degrader-Linker compound of claim 76 or 77, or a pharmaceutically acceptable salt thereof, wherein R1is a chemical moiety represented by the formula:-(A)q-, wherein: q is an integer from 1 to 14; each A is independently selected from the group consisting of CR1aR1b, O, S, SO, SO2, NR1c, SO2NR1c, SONR1c, SO(=NR1c), SO(=NR1c)NR1d, CONR1c, NR1cCONR1d, NR1cC(O)O, NR1cSO2NR1d, CO, CR1a=CR1b, C=C, SiR1aR1b, P(O)R1a, P(O)OR1a, (CR1aR1b)1-4, -(CR1aR1b)1-4O(CR1aR1b)1-4, -(CR1aR1b)1-4S(CR1aR1b)1-4, - (CR1aR1b)1-4NR(CR1aR1b)1-4,NR1cC(=NCN)NR1dNR1cC(=NCN), NR1cC(=CNO2)NR1d, 3-11 membered cycloalkyl, optionally substituted with 0-6 R1aand / or R1bgroups, 3-11 membered heteocyclyl optionally substituted with 0-6 R1aand / or R1bgroups, aryl optionally substituted with 0-6 R1aand / or R1bgroups, and heteroaryl optionally substituted with 0-6 R1aand / or R1bgroups, wherein R1a, R1b, R1c, R1dand R1eare each independently, -H, deuterium, - halo, -C1-C8alkyl, -O-C1-C8alkyl, -C1-C6haloalkyl, -S-C1-C8alkyl,-NHC1-C8alkyl, - N(C1-C8alkyl)2, 3-11 membered cycloalkyl, aryl, heteroaryl, 3-11 membered heterocyclyl, -O-(3-11 membered cycloalkyl), -S-(3-11 membered cycloalkyl), NH- (3-11 membered cycloalkyl), N(3-11 membered cycloalkyl)2, N-(3-11 membered cycloalkyl)(C1-C8alkyl), -OH, -NH2, -SH, -SO2C1-C8alkyl, SO(NH)C1-C8alkyl, P(O)(OC1-C8alkyl)(C1-C8alkyl), -P(O)(OC1-C8alkyl)2, -C=C-C1-C8alkyl, -C=CH, -CH=CH(C1-C8alkyl), -C(C1-C8alkyl)=CH(C1-C8alkyl), -C(C1-C8alkyl)=C(C1- C8alkyl)2, -Si(OH)3, -Si(C1-C8alkyl)3, -Si(OH)(C1-C8alkyl)2, -C(O)C1-C8alkyl, - CO2H, -CN, -CF3, -CHF2, -CH2F, -NO2, -SF5, -SO2NHC1-C8alkyl, -SO2N(CI- C8alkyl)2, -SO(NH)NHC1-C8alkyl, -SO(NH)N(C1-C8alkyl)2, -SONHC1-C8alkyl, - SON(C1-C8alkyl)2, -CONHC1-C8alkyl, -CON(C1-C8alkyl)2, -N(C1- C8alkyl)CONH(C1-C8alkyl), -N(C1-C8alkyl)CON(C1-C8alkyl)2, -NHCONH(C1- C8alkyl), -NHCON(C1-C8alkyl)2, -NHCONH2, -N(C1-C8alkyl)SO2NH(C1-C8alkyl), - N(C1-C8alkyl)SO2N(C1-C8alkyl)2, -NHSO2NH(C1-C8alkyl), -NHSO2N(C1-C8alkyl)2, or -NHSO2NH2; and where R1aor R1b, each independently may be optionally linked to other groups to form cycloalkyl and / or heterocyclyl moiety, optionally substituted with 0-4 R1egroups.

80. The Degrader-Linker compound of any one of claims 76 to 79, or a pharmaceutically acceptable salt thereof, wherein ULM binds Von Hippel-Lindau E3 Ubiquitin Ligase.

81. The Degrader-Linker compound of claim 80, or a pharmaceutically acceptable salt thereof, wherein ULM is a moiety having the Formula ULM-I-VHL-1 :wherein the dashed line ( ---- ) indicates the position of attachment of ULM-I-VHL-1 to R1;R15is hydrogen or -PO3H2;V is H or F;R3is optionally substituted phenyl, optionally substituted napthyl, or an optionally substituted 5-10 membered heteroaryl; one of R4or R5is H, deuterium, haloalkyl, optionally substituted alkyl, optionally substituted cycloalkyl, optionally substituted heterocycloalkyl, -CORdv, or CONRe1Re2; the other of R4or R5is H or deuterium; or R4and R5, together with the carbon atom to which they are both attached, form anoptionally substituted 3-5 membered cycloalkyl or heterocyclyl;W3is an optionally substituted aryl, optionally substituted heteroaryl, orR6and R7are independently H, deuterium, optionally substituted alkyl, optionally substituted cycloalkyl, or optionally substituted haloalkyl, or R6, R7, and the carbon atom to which they are attached form an optionally substituted cycloalkyl or optionally substituted heterocyclyl;R8is an optionally substituted heterocyclyl, optionally substituted heteroaryl, optionally substituted aryl, CONRavRbv, NRavRbv,Ravis H or optionally substituted alkyl;Rbvis H, -C(O)-* wherein * is a point of attachment to R1, optionally substituted alkyl, optionally substituted alkylcarbonyl, optionally substituted (cycloalkyl)alkylcarbonyl, optionally substituted aralkylcarbonyl, optionally substituted arylcarbonyl, optionally substituted (cycloalkyl)carbonyl, optionally substituted (heterocyclyl) carbonyl, or optionally substituted aralkyl; each Rcis independently H, halo, optionally substituted alkoxy, cyano, optionally substituted alkyl, haloalkyl, or haloalkoxy; each Rdvis independently H, optionally substituted alkyl or NRe1Re2; each Re1and Re2is independently H, deuterium, or optionally substituted alkyl, or Re1and Re2together with the nitrogen atom to which they are attached form a 4-7 membered heterocyclyl; and p is 0, 1, 2, 3, or 4.

82. The Degrader-Linker compound of claim 80 or 81, wherein ULM-I-VHL-1 is a compound of formula:wherein * is a point of attachment of the ULM to R1.

83. The Degrader-Linker compound of any one of claims 80 to 82, or a pharmaceutically acceptable salt thereof, wherein D has a structure of:whereinW is optionally substituted -CH2-, -C(O)-, -S(O)-, or -S(O)2-; wherein when n = 2 or3, only one W may be -C(O)-, -S(O)-, or -S(O)2-; n = 0-3; m = 1-3;Rk= H, deuterium, F, C1-3alkyl, C1-3haloalkyl, or C1-4alkoxyl; s = 0-3;Rc1and Rd1are independently H, deuterium, Halo, C1-3alkyl, C1-3haloalkyl, or C1-4alkoxyl;Re3is H, -C(O)Rf, -CH2-O-P(O)(ORg)2, or -P(O)(ORg)2; wherein Rfand Rgare independently H, C1-4alkyl, C1-4substituted alkyl, C3-8cyclcoalkyl, C3-8substituted cyclcoalkyl, C3-8heterocyclcoalkyl, or C3-8substituted heterocyclcoalkyl;R1is a covalent bond, 3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups, 3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups, -(CR1aR1b)1-5, -(CR1a=CR1b)-, -(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, - (CR1aR1b)1-5-A-(CR1aR1b)1-5- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(CR1a=CR1b)-(CR1aR1b)1-5-, -(CR1aR1b)1-5-( CR1a=CR1b)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(C=C)-(CR1aR1b)1-5-, - (CR1aR1b)1-5-(C=C)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, -(C=C)-(CR1aR1b)1-5-A- (CR1aR1b)1-5- wherein A is O, S, or NR1c, -(C=C)-(CR1aR1b)1-5, -(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-, -(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-, -(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-, - (3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups) - (CR1aR1b)1-5-, -(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-A-, -(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-A-, -(CR1aR1b)1-5-(3-l l membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5, -(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5, -(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-A- wherein Ais O, S, or NR1c, -(CR1aR1b)1-5-A-(3-11 membered heterocyclyl optionally substituted with 0- 6 R1aand / or R1bgroups)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein each A is independently O, S, or NR1c, -(CR1aR1b)1-5-A-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein each A is independently O, S, or NR1c, -(CR1aR1b)1-5-A-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, - (CR1aR1b)1-5-A-(CR1aR1b)1-5-A-(CR1aR1b)1-5-A-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, - (CR1aR1b)1-5-A-(CO) wherein A is O, S, or NR1c, -(CR1aR1b)1-5-( CR1a=CR1b)-(CR1aR1b)1-5-A- (CO)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(C=C)-(CR1aR1b)1-5-A-(CO)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A-(CO)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A-(CO)- (3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A-(CO)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A- (CO)-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-A-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-A-(CO)- wherein each A is independently O, S, or NR1c, -(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)- CO-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A-(CO)- wherein A is O, S, or NR1c, -(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A-(CO)- wherein A is O, S, or NR1c, -(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-, or -(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-; or R1is -(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)- (CO)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c; -(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CO)-A-(CR1aR1b)1-5- wherein A is O, S, or NR1c; -A-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)- (CR1aR1b)1-5-A- wherein each A is independently O, S, or NR1c; -(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c; -(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c; -(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-A-(CR1aR1b)1-5-A- wherein each A is independently O, S, or NR1c; -(heteroaryl optionally substituted with 0-4 R1aand / or R1bgroups)-A-(CR1aR1b)1-5- wherein A is O, S, or NR1c; -(3-11 membered heterocyclyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c; -(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CO)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c; -(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CO)-A-(CR1aR1b)1-5- wherein A is O, S, or NR1c; or -(CO)-(3-11 membered cycloalkyl optionally substituted with 0-6 R1aand / or R1bgroups)-(CR1aR1b)1-5-A- wherein A is O, S, or NR1c;R4is H, optionally substituted alkyl, optionally substituted C1-C6alkyl, or -CH3;R7is optionally substituted alkyl, preferably optionally substituted C1-C6alkyl, and more preferably C1-C6alkyl; andR9is H, deuterium, halo, -CN, -OH, -NO2, -NRe1Re2, -ORe1, -CONRe1Re2, - NRe1CORe2, -SO2NRe1Re2, -NRe1SO2Re2, optionally substituted alkyl, optionally substituted alkoxyl, optionally substituted haloalkyl, optionally substituted haloalkoxy; optionally substituted aryl; optionally substituted heteroaryl; optionally substituted cycloalkyl; or optionally substituted heterocyclyl;R1a, R1b, R1c, and R1eare each independently, -H, deuterium, -halo, -C1-C8alkyl, -C1- C6haloalkyl, -O-C1-C8alkyl, -S-C1-C8alkyl, -NHC1-C8alkyl, -N(C1-C8alkyl)2, 3-11 membered cycloalkyl, aryl, heteroaryl, 3-11 membered heterocyclyl, -O-(3-11 membered cycloalkyl), - S-(3-11 membered cycloalkyl), NH-(3-11 membered cycloalkyl), N(3-11 membered cycloalkyl)2, N-(3-11 membered cycloalkyl)(C1-C8alkyl), -OH, -NH2, -SH, -SO2C1-C8alkyl, SO(NH)C1-C8alkyl, P(O)(OC1-C8alkyl)(C1-C8alkyl), -P(O)(OC1-C8alkyl)2, -C=C-C1-C8alkyl, -C=CH, -CH=CH(C1-C8alkyl), -C(C1-C8alkyl)=CH(C1-C8alkyl), -C(C1-C8alkyl)=C(C1- C8alkyl)2, -Si(OH)3, -Si(C1-C8alkyl)3, -Si(OH)(C1-C8alkyl)2, -C(O)C1-C8alkyl, -CO2H, -CN, - CF3, -CHF2, -CH2F, -NO2, -SF5, -SO2NHC1-C8alkyl, -SO2N(C1-C8alkyl)2, -SO(NH)NHC1- C8alkyl, -SO(NH)N(C1-C8alkyl)2, -SONHC1-C8alkyl, -SON(C1-C8alkyl)2, -CONHC1-C8alkyl, -CON(C1-C8alkyl)2, -N(C1-C8alkyl)CONH(C1-C8alkyl), -N(C1-C8alkyl)CON(C1-C8alkyl)2, - NHCONH(C1-C8alkyl), -NHCON(C1-C8alkyl)2, -NHCONH2, -N(C1-C8alkyl)SO2NH(C1- C8alkyl), -N(C1-C8alkyl)SO2N(C1-C8alkyl)2, -NHSO2NH(C1-C8alkyl), -NHSO2N(CI- C8alkyl)2, or -NHSO2NH2; or where the context permits, R1aor R1b, are linked to other groups,or to each other, to form a cycloalkyl and / or a heterocyclyl moiety, optionally substituted with 0-4 R1egroups; and each Re1and Re2is independently H, deuterium, or optionally substituted alkyl, or Re1and Re2together with the nitrogen atom to which they are attached form a 4-7 membered heterocyclyl.

84. The Degrader-Linker compound of any one of claims 80 to 83, or a pharmaceutically acceptabe salt thereof, wherein D has a structure of:wherein the wavy line indicates the point of covalent attachment to L’.

85. The Degrader-Linker compound of any one of claims 80 to 83, or a pharmaceutically acceptable salt thereof, wherein D has a structure of:wherein the wavy line indicates the point of covalent attachment to L’.

86. The Degrader-Linker compound of any one of claims 80 to 83, or a pharmaceutically acceptable salt thereof, wherein D has a structure of:wherein the wavy line indicates the point of covalent attachment to L’.

87. The Degrader-Linker compound of claim 80 or 81, or a pharmaceutically acceptable salt thereof, wherein D has a structure of:wherein R15is hydrogen or-PO3H2and the wavy line indicates the point of covalent attachment to L’ .

88. The Degrader-Linker compound of claim 87, or a pharmaceutically acceptable salt thereof, wherein D has a structure of:

89. The Degrader-Linker compound of any one of claims 76 to 79, or a pharmaceutically acceptable salt thereof, wherein ULM binds Cereblon E3 Ubiquitin Ligase.

90. The Degrader-Linker compound of claim 89, or a pharmaceutically acceptable salt thereof, wherein ULM is a moiety having the Formula ULM-II-CRBN:wherein:is a point of attachment to PTM;Ring A is a monocyclic, bicyclic or tricyclic aryl, heteroaryl or heterocycle group, L1is a bond, -O-, -S-, -NRa-, -C(Ra)2-, or -C(O)NRa-;X1is a bond, -C(O)-, -C(S)-, -CH2-, -CHCF3-, SO2-, -S(O), P(O)Rb- or -P(O)ORb-;X2is -C(Ra)2-, -NRa- or -S-;R2is H, deuterium, optionally substituted C1-4alkyl, C1-4alkoxyl, C1-4haloalkyl, -CN, -ORa, -ORbor -SRb; each R3is independently H, deuterium, halogen, oxo, -OH, -CN, -NO2, -C1-C6alkyl, - C2-C6alkenyl, -C2-C6alkynyl, C0-C1alk-aryl, C0-C1alk-heteroaryl, cycloalkyl, cycloalkenyl, heterocycloalkyl, or heterocycloalkenyl, -ORa, -SRa, -NRc2Rd, -NRaRc2, -C(O)Rb, -OC(O)Ra, -C(O)ORa, -C(O)NRc2Rd, -S(O)Rb, -S(O)2NRc2Rd, -S(O)(=NRb)Rb, -SF5, -P(O)RbRb, - P(O)(ORb)(ORb), -B(ORd)(ORc2) or -S(O)2Rb; each Rais independently H, deuterium, -C(O)Rb, -C(O)ORc2, -C(O)NRc2Rd, - C(=NRb)NRbRc2-C(=NORb)NRbRc2-C(=NCN)NRbRc2-P(ORc2)2, -P(O)Rc2Rb, - P(O)ORc2ORb, -S(O)Rb, -S(O)NRc2Rd, -S(O)2Rb, -S(O)2NRc2Rd, SiRb3, -C1-C10alkyl, -C2-C10alkenyl, -C2-C10alkynyl, aryl, cycloalkyl, cycloalkenyl, heteroaryl, heterocycloalkyl, or heterocycloalkenyl; each Rb, is independently H, deuterium, -C1-C6alkyl, -C2-C6alkenyl, -C2-C6alkynyl, aryl, cycloalkyl, cycloalkenyl, heteroaryl, heterocycloalkyl, or heterocycloalkenyl; each Rc2or Rdis independently H, deuterium, -C1-C10alkyl, -C2-C6alkenyl, -C2-C6alkynyl, -OC1-C6alkyl, -O-cycloalkyl, aryl, heteroaryl, cycloalkyl, cycloalkenyl, heterocycloalkyl, or heterocycloalkenyl; orRc2and Rd, together with the atom to which they are both attached, form a monocyclicor multicyclic heterocycloalkyl, or a monocyclic or multicyclic heterocyclo-alkenyl group; and o is 1, 2, 3, 4, or 5.

91. The Degrader-Linker compound of claim 89 or 90, or a pharmaceutically acceptable salt thereof, wherein ULM-II-CRBN is a compound of formula:wherein each X3is independently N, N-oxide or CR3and at least one X3is N or N- oxide; whereinis a point of attachment to PTM; orwherein each X3is independently N, N-oxide or CR3; wherein each Y1is independently -C(O)- or -C(Ra)2- and at least one Y1is -C(O)-; and whereinis a point of attachment to PTM; orwherein each X3is independently N, N-oxide or CR3and whereinis a point of attachment to PTM; orwherein each X3is independently N, N-oxide or CR3and whereinis a point of attachment to PTM.

92. The Degrader-Linker compound of any one of claims 89 to 91, or a pharmaceutically acceptable salt thereof, wherein D has a structure of:wherein the wavy line indicates the point of covalent attachment to L’;Rhis methyl or ethyl;R1ais hydrogen, C1-3alkyl, or halo; each of Zc1and Zc2is independently CH or N; and U1is -CH2- or -C(O)-.

93. The Degrader-Linker compound of claim 92, or a pharmaceutically acceptable salt thereof, wherein D has a structure of:indicates the point of covalent attachment to L’.

94. The Degrader-Linker compound of any one of claims 76 to 93, or a pharmaceutically acceptable salt thereof, having the formula of:

95. The Degrader-Linker compound of any one of claims 76 to 94, or a pharmaceutically acceptable salt thereof, whereinAA is present; subscript c is an integer ranging between 1 and 12; and each Ra1is independently -COOH, -NH2, or an independently selected side chain of an amino acid, wherein each amino acid is selected from the group consisting of alanine, valine, glutamic acid, citrulline, tryptophan, glycine, phenylalanine, and lysine.

96. The Degrader-Linker compound of claim 94 or 95, or a pharmaceutically acceptable salt thereof, represented by the structure of:wherein each Rm1is hydrogen, halogen, or -S-Ph; subscript b is an integer ranging from 1 to 5; subscript c is an integer ranging from 1 to 5; each Ra1is independently the side chain of valine, glutamic acid, tryptophan, glycine, citrulline, lysine, alanine, or phenylalanine; each Rjis independently fluorine, chlorine, methyl, or -C(O)NHCH3; and subscript k is an integer ranging from 0 to 4.

97. The Degrader-Linker compound of claim 96, or a pharmaceutically acceptable salt thereof, represented by the structure of:wherein each Rjis methyl, -F, -Cl, or -C(O)NHCH3, and subscript k is 0 or 1.

98. The Degrader-Linker compound of claim 96, or a pharmaceutically acceptable salt thereof, represented by the structure of:

99. The Degrader-Linker compound of claim 98, or a pharmaceutically acceptable salt thereof, represented by the structure of:

100. The Degrader-Linker compound of claim 94 or 95, or a pharmaceutically acceptable salt thereof, represented by the structure of:each Rm1is hydrogen, halogen, or -S-Ph; subscript b is an integer ranging from 1 to 5; subscript w is an integer ranging from 1 to 8; subscript c is an integer ranging from 1 to 3; each Ra1is independently the side chain of valine, glutamic acid, tryptophan, glycine, citrulline, lysine, alanine, or phenylalanine; each Rjis independently fluorine, chlorine, methyl, or -C(O)NHCH3; and subscript k is an integer ranging from 0 to 4.

101. The Degrader-Linker compound of claim 100, or a pharmaceutically acceptable saltthereof, represented by the structure of:wherein Rjis methyl, -F, -Cl, or -C(O)NHCH3, and subscript k is 0 or 1.

102. The Degrader-Linker compound of claim 100, or a pharmaceutically acceptable salt thereof, represented by the structure of:

103. The Degrader-Linker compound of claim 94 or 95, or a pharmaceutically acceptable salt thereof, represented by the structure of:wherein subscript b is an integer ranging from 1 to 5; subscript c is an integer ranging from 1 to 3;Rx1is hydrogen, -COOH, -C(O)NHCH3, or -(C(O)NHCH2)x(CH2OCH2)yRx2, wherein Rx2is -CH2NHC(O)CH3, - CH2NH2, or - CH2C(O)ORx2a, wherein Rx2ais hydrogen or C1-C6alkyl; each Ra1is independently the side chain of valine, glutamic acid, tryptophan, glycine, citrulline, lysine, alanine, or phenylalanine; each Rjis independently fluorine, chlorine, methyl, or -C(O)NHCH3; and subscript k is an integer ranging from 0 to 4.

104. The Degrader-Linker compound of claim 103, or a pharmaceutically acceptable salt thereof, wherein Rx1is105. The Degrader-Linker compound of claim 94 or 95, or a pharmaceutically acceptable salt thereof, represented by the structure of:wherein subscript b is an integer ranging from 1 to 5; subscript c is 1 or 2; each Ra1is independently the side chain of valine or citrulline; each Rjis independently fluorine, chlorine, methyl, or -C(O)NHCH3; and subscript k is an integer ranging from 0 to 4.

106. The Degrader-Linker compound of claim 105, or a pharmaceutically acceptable salt thereof, represented by the structure of:

107. The Degrader-Linker compound of claim 105 or 106, or a pharmaceutically acceptable salt thereof, represented by the structure of:

108. The Degrader-Linker compound of claim 94 or 95, or a pharmaceutically acceptable salt thereof, represented by the structure of:wherein subscript b is an integer ranging from 1 to 5; subscript c is 1 or 2;each Ra1is independently the side chain of valine or citrulline; each Rjis independently fluorine, chlorine, methyl, or -C(O)NHCH3; and subscript k is an integer ranging from 0 to 4.

109. The Degrader-Linker compound of claim 108, or a pharmaceutically acceptable salt thereof, represented by the structure of:

110. The Degrader-Linker compound of claim 108, or a pharmaceutically acceptable salt thereof, represented by the structure of:

111. The Degrader-Linker compound of claim 94 or 95, or a pharmaceutically acceptable salt thereof, represented by the structure of:wherein E is -CH2- or -O-; Rjis methyl, -F, -Cl, or -C(O)NHCH3; and subscript k is 0 or 1.

112. The Degrader-Linker compound of claim 94 or 95, or a pharmaceutically acceptable salt thereof, represented by the structure of:wherein E is -CH2- or -O-; Rhis methyl or ethyl; and R1ais hydrogen or methyl.

113. The Degrader-Linker compound of claim 94 or 95, or a pharmaceutically acceptable salt thereof, represented by the structure of:wherein subscript w is 1 or 2; each Rjis independently fluorine, chlorine, methyl, or -C(O)NHCH3; and subscript k is an integer ranging from 0 to 4.

114. The Degrader-Linker compound of claims 94 or 95, or a pharmaceutically acceptable salt thereof, represented by the structure of:

115. The Degrader-Linker compound of claim 94 or 95, or a pharmaceutically acceptable salt thereof, represented by the structure of:whereinRb1and Rb2are each independently hydrogen, C1-C6alkyl, or both Rb1and Rb2, together with the carbon to which they are attached, comprise a C4-C6cycloalkyl or a C4-C6heterocycloalkyl;Rb3and Rb4are each independently hydrogen or C1-C6alkyl; and subscript si is 0.

116. The Degrader-Linker compound of claim 115, or a pharmaceutically acceptable salt thereof, represented by the structure of:

117. The Degrader-Linker compound of claim 116, or a pharmaceutically acceptable salt thereof, wherein U, X, and AA are each absent.

118. The Degrader-Linker compound of claim 117, or a pharmaceutically acceptable salt thereof, represented by the structure of:wherein T is absent or is -CH2CH2- and K is -CH2- or -NH2-.

119. The Degrader-Linker compound of claim 118, or a pharmaceutically acceptable salt thereof, represented by the structure of:

120. The Degrader-Linker compound of claim 119, or a pharmaceutically acceptable salt thereof, represented by the structure of:

121. The Degrader-Linker compound of claim 117, or a pharmaceutically acceptable salt thereof, represented by the structure of:

122. The Degrader-Linker compound of claim 121, or a pharmaceutically acceptable salt thereof, represented by the structure of:

123. The Degrader-Linker compound of claim 80 or 81, or a pharmaceutically acceptablewherein R15is hydrogen or -PO3H2.

124. The Degrader-Linker compound of claim 123, or a pharmaceutically acceptable salt thereof, represented by the structure of:wherein subscript c is an integer ranging between 1 and 4; subscript w is an integer ranging between 1 and 8; and U is absent or is -CH2-(C=O)-(NH)-.

125. The Degrader-Linker compound of claim 80 or 81, or a pharmaceutically acceptable salt thereof, represented by the structure of:wherein R15is hydrogen or -PO3H2.

126. The Degrader-Linker compound of claim 125, or a pharmaceutically acceptable salt thereof, represented by the structure of:wherein subscript c is an integer ranging between 1 and 4; andU is -(CH2CH2O)wCH2CH2(NH)-, wherein subscript w is an integer ranging from 1 to 4.

127. A Degrader-Linker compound, or a pharmaceutically acceptable salt thereof, represented by the structure of:wherein,L’ is a linker precursor of Formula each D is independently a degrader compound of Formula (I):wherein,PTM is a moiety of Formula IA:wherein,R1is a covalent bond, or chemical moiety that links PTM and ULM;* is a point of attachment to ULM; n = 0-3; each W is independently optionally substituted -CH2-, -C(O)-, -S(O)-, or -S(O)2-, wherein when n = 2 or 3, only one W is -C(O)-, -S(O)-, or -S(O)2-, and the other W are -CH2- or substituted -CH2-;Rc1and Rd1are independently H, deuterium, Halo, C1-3alkyl, C1-3haloalkyl, or C1-4alkoxyl;Re3is hydrogen, -C(O)Rf, or -P(O)(ORg)2; wherein Rfand Rgare independently H, C1-4alkyl, C1-4substituted alkyl, C3-8cyclcoalkyl, C3-8substituted cyclcoalkyl, C3-8heterocyclcoalkyl, or C3-8substituted heterocyclcoalkyl;Z and Y are each independently N; CRhwherein Rh= H, C1-3alkyl, or absent; or, if R1is attached to Z, then Z is C and Y is N or CRhwherein Rhis H or C1-3alkyl; or if R1is attached to Y, then Y is C and Z is N or CRhwherein Rhis H or C1-3alkyl;B is an optionally substituted 5-7 membered cycloalkyl ring, an optionally substituted 5-7 membered heteroaryl ring, or an optionally substituted 5-7 membered heterocyclic ring, wherein ring B is fused to ring G through Y and Z; andULM is a small molecule E3 Ubiquitin Ligase binding moiety that binds a Von Hippel -Lindau E3 Ubiquitin Ligase or a Cereblon E3 Ubiquitin Ligase.

128. The Degrader-Linker compound of claim 127, or a pharmaceutically acceptable salt thereof, wherein L’ is a linker precursor of Formula (iii):whereinM’ is selected from the group consisting of:wherein each Rm1and Rm2is independently hydrogen, halogen, or -S-Ph;Rm3and Rm4are each halogen;Rb1and Rb2are each independently hydrogen or C1-C6alkyl, or Rb1and Rb2together with the carbon to which they are attached form a C4-C6cycloalkyl or a C4-C6heterocycloalkyl;Rb3and Rb4are each independently hydrogen or C1-C6alkyl, subscript si is 0 or 1; wherein the wavy line of M’ indicates the point of covalent attachment to the remainder of the structure of L’ and the wavy line of Formula (iii) indicates the point of covalent attachment to the degrader compound (D); andU is absent or is -(CH2)b(Rv1)ss(C=O)u(NH)v- wherein subscript b is 0, 1, 2, 3, 4, or 5; subscript ss is 0 or 1; subscript u is 0 or 1; subscript v is 0 or 1;Rv1is -C3-C6cycloalkyl- or -C3-C6cycloalkyl-C(O)NHCH2-Rv2-, whereinRv2is C3-C6cycloalkyl, C3-C6heterocycle, or C3-C6heteroaryl; or-(CH2CH2O)wCH2CH2(NH)-, wherein subscript w is an integer ranging from1 to 16;X is absent or is-(CH2CH2O)wCH2CH2-(C=O)d- wherein subscript w is an integer ranging from 0 to 16 and subscript d is 0 or 1;-CH(Rx1)(CH2)nnC(O)-, wherein Rx1is hydrogen, -COOH, - C(O)NHCH3, or -(C(O)NHCH2)x(CH2OCH2)yRx2, wherein Rx2is - CH2NHC(O)CH3, - CH2NH2, or - CH2C(O)ORx2a, wherein Rx2ais hydrogen or C1-C6alkyl; subscript nn is an integer ranging from 1 to 6; subscript x and subscript y are each independently an integer ranging from 0 to 8;-C(O)-C(Rx3)(Rx4)-C(O)-, wherein Rx3and Rx4are independently hydrogen or C1-C6alkyl or Rx3and Rx4together with the carbon to which they are attached form a C3-C6cycloalkyl;-heterocycloalkyl-O(CH2)iC(O)-, wherein subscript i is an integer ranging from 0 to 6;-C(O)-C(Rx5)(Rx6)-OC(O)-, wherein Rx5is hydrogen or C1-C6alkyl and Rx6is hydrogen, C1-C6alkyl,wherein subscript f is an integer ranging from 0 to 4, and each Rx7is independently hydrogen, -COOH, -NH2, C1-C6alkyl, or an independently selected side chain of an amino acid; or-(CH2CH2O)yyCH2CH2NHC(O)CH2OCH2C(O)-, wherein subscript yy is an integer ranging from 0 to 16;YY is a branching unit selected from the group consisting of:wherein each qq is independently -N(Ry1)- or -O-, wherein Ry1is hydrogen or C1-C6alkyl;the wavy line indicates the point of attachment to X, when present, or U, when X is absent, or M’, when X and U are absent; and each dashed line indicates the point of attachment to ZZ when ZZ is present, or A A when ZZ is absent, or J when AA and ZZ are absent, or G when AA, ZZ, and J are absent; each ZZ is independently -(CH2CH2O)wCH2CH2C(O)-, wherein subscript w’ is an integer ranging from 0 to 16; each AA is independently absent or has the structure of:wherein subscript c is an integer ranging from 1 to 12; each Ra1is independently -COOH, -NH2, or an independently selected side chain of an amino acid; each J is independently absent, -(Rj3)N(C(Rj1)(Rj2))m1, or has the structure of.wherein Rj3is hydrogen, C1-C6alkyl, or C3-C6cycloalkyl; each Rj1and Rj2is independently hydrogen, C1-C6alkyl, C3-C6cycloalkyl, - OH, or -NRj4Rj5, wherein Rj4and Rj5are each -OH or C1-C6alkyl; subscript ml is an integer ranging from 1 to 6; each Rjis independently halogen, C1-C6alkyl, or -C(O)NH(C1-C6alkyl); subscript k is an integer ranging from 0 to 4; each G is independently absent,wherein the wavy line to each G of Formula (iii) indicates the point of covalent attachment to an independently selected D.

129. The Degrader-Linker compound of claim 128, or a pharmaceutically acceptable salt thereof, wherein L’ has the structure of130. The Degrader-Linker compound of claim 128 or 129, or a pharmaceutically acceptable salt thereof, wherein L’ has the structure ofwhereinU is absent or is -(CH2)b(Rv1)ss(C=O)u(NH)v-, wherein subscript b is 0, 1, 2, 3, 4, or 5; subscript ss is 0 or 1; subscript u is 0 or 1; subscript v is 0 or 1; Rv1is -C3-C6cycloalkyl- or -C3-C6cycloalkyl-C(O)NHCH2-Rv2-, wherein Rv2is C3-C6cycloalkyl, C3-C6heterocycle, or C3-C6heteroaryl;X is absent or is -(CH2CH2O)wCH2CH2-(C=O)d-, wherein subscript w is an integer ranging from 0 to 8 and subscript d is 0 or 1;subscript c is an integer ranging from 1 to 12 and each Ra1is independently - COOH, -NH2, or an independently selected side chain of an amino acid, wherein each amino acid is selected from the group consisting of alanine, valine, glutamic acid, citrulline, tryptophan, glycine, phenylalanine, and lysine; each Rjis independently fluorine, chlorine, methyl, or -C(O)NHCH3; and subscript k is an integer ranging from 0 to 4.

131. The Degrader-Linker compound of any one of claims 128-130, or a pharmaceutically acceptable salt thereof, wherein L’ has the structure of132. The Degrader-Linker compound of claim 127, or a pharmaceutically acceptable salt thereof, wherein L’ is a linker precursor of Formula (iib) :wherein subscript dd is 2;M’ is selected from the group consisting of:wherein each Rm1and Rm2is independently hydrogen, halogen, or -S-Ph;Rm3and Rm4are each halogen;Rb1and Rb2are each independently hydrogen or C1-C6alkyl, or Rb1and Rb2together with the carbon to which they are attached form a C4-C6cycloalkyl or a C4-C6heterocycloalkyl;Rb3and Rb4are each independently hydrogen or C1-C6alkyl, subscript si is 0 or 1; wherein the wavy line of M’ indicates the point of covalent attachment to the remainder of the structure of L’ and the wavy line of Formula (iii) indicates the point of covalent attachment to the degrader compound (D); andU is absent or is -(CH2)b(Rv1)ss(C=O)u(NH)v- wherein subscript b is 0, 1, 2, 3, 4, or 5; subscript ss is 0 or 1; subscript u is 0 or 1; subscript v is 0 or 1;Rv1is -C3-C6cycloalkyl- or -C3-C6cycloalkyl-C(O)NHCH2-Rv2-, whereinRv2is C3-C6cycloalkyl, C3-C6heterocycle, or C3-C6heteroaryl; or-(CH2CH2O)wCH2CH2(NH)-, wherein subscript w is an integer ranging from 1 to 16;X is absent or is-(CH2CH2O)wCH2CH2-(C=O)d- wherein subscript w is an integer ranging from 0 to 16 and subscript d is 0 or 1;-CH(Rx1)(CH2)nnC(O)-, wherein Rx1is hydrogen, -COOH, -C(O)NHCH3, or -(C(O)NHCH2)x(CH2OCH2)yRx2, wherein Rx2is -CH2NHC(O)CH3, - CH2NH2, or - CH2C(O)ORx2a, wherein Rx2ais hydrogen or C1-C6alkyl; subscript nn is an integer ranging from 1 to 6; subscript x and subscript y are each independently an integer ranging from 0 to 8;-C(O)-C(Rx3)(Rx4)-C(O)-, wherein Rx3and Rx4are independently hydrogen or C1-C6alkyl or Rx3and Rx4together with the carbon to which they are attached form a C3-C6cycloalkyl;-heterocycloalkyl-O(CH2)iC(O)-, wherein subscript i is an integer ranging from 0 to 6;-C(O)-C(Rx5)(Rx6)-, wherein Rx5is hydrogen or C1-C6alkyl and Rx6is hydrogen, C1-C6alkyl,wherein subscript f is an integer ranging from 0 to 4 and each Rx7is independently hydrogen, -COOH, -NH2, C1-C6alkyl, C1-C6alkyl, or an independently selected side chain of an amino acid; or -(CH2CH2O)yyCH2CH2NHC(O)CH2OCH2C(O)-, wherein subscript yy is an integer ranging from 0 to 16;YY is a branching unit having the structure of:whereinqq1and qq2are each independently -N(Ry1)- or -O-, wherein Ry1is hydrogen or C1-C6alkyl, and the wavy line of YY indicates the point of attachment to X, when present, or to U when X is absent, or to M when X and U are absent; and the dashed lines of YY indicate the point of attachment to EE when EE is present, or to A A when EE is absent, or to J when AA and EE are absent, or to G when AA, EE, and J are absent, and to NN;NN is -(CH2CH2O)k’CH2CH2C(O)-Rnn1-, wherein subscript k’ is an integer ranging from 0 to 16 and Rnn1is hydrogen, C1-C6alkyl, or -OH; each EE is independently absent or -(CH2CH2O)XCH2CH2C(O)-, wherein subscript x’ is an integer ranging from 0 to 16; each AA is independently absent or has the structure of:wherein subscript c is an integer ranging from 1 to 12; each Ra1is independently -COOH, -NH2, or an independently selected side chain of an amino acid; each J is independently absent, -(Rj3)N(C(Rj1)(Rj2))m1, or has the structure of.wherein Rj3is hydrogen, C1-C6alkyl, or C3-C6cycloalkyl; each Rj1and Rj2is independently hydrogen, C1-C6alkyl, C3-C6cycloalkyl, - OH, or -NRj4Rj5, wherein Rj4and Rj5are each -OH or C1-C6alkyl; subscript ml is an integer ranging from 1 to 6; each Rjis independently halogen, C1-C6alkyl, or -C(O)NH(C1-C6alkyl);subscript k is an integer ranging from 0 to 4; each G is independently absent,wherein the wavy line to each G of Formula (iib) indicates the point of covalent attachment to an independently selected D.

133. An Antibody Drug Conjugate compound of Table 1, or a pharmaceutically acceptable salt thereof.

134. A Degrader-Linker compound of Table 2, or a pharmaceutically acceptable salt thereof.

135. The Antibody Drug Conjugate compound of any one of claims 1 to 67, or a pharmaceutically acceptable salt thereof, wherein Ab binds to CALR antigen.

136. The Antibody Drug Conjugate compound of claim 135, or a pharmaceutically acceptable salt thereof, wherein Ab is an anti -CALR antibody.

137. A method of preparing the Antibody Drug conjugate compound of claim 135 or 136, the method comprising: buffer exchanging a solution of a reduced Ab to produce a buffer exchanged solution of the reduced Ab; and contacting a degrader-linker compound with the buffer exchanged solution of the reduced Ab to produce the Antibody Drug Conjugate compound.