The application discloses a
bifunctional compound and use thereof, the
bifunctional compound is a
bifunctional compound with K-L-S structure, wherein: K is a targeting group of
cyclin 7CDK7;S is a covalent group targeting
cysteine or
lysine on CDK7
protein;L is a
divalent linking group chemically connecting the targeting group K and the covalent group S;The bifunctional compound or does not contain
divalent linking group L, and the targeting group K is directly connected with the covalent group S.The bifunctional compound or its pharmaceutically acceptable salt, ester,
hydrate, solvate or stereoisomer and the pharmaceutical composition containing the same show pharmacological activity related to degradation, inhibition of
target protein CDK7, and can be used for preventing and treating CDK7 related diseases or disorders.