The present invention provides a
solid form of a compound of formula (I) or a solvate thereof having
autotaxin (ATX) inhibitory activity, wherein the
solid form comprises a crystalline form and / or an amorphous form. The crystalline form comprises two non-solvate crystalline forms: crystalline form A and crystalline form L; six
hydrate crystalline forms: crystalline form B (dihydrate), crystalline form D (trihydrate), crystalline form G (
tetrahydrate), crystalline form H (monohydrate), crystalline form K (dihydrate) and crystalline form M-1 (monohydrate); and seven solvate crystalline forms: crystalline form C (hemitoluene solvate), crystalline form E (
chloroform solvate), crystalline form N (
dichloromethane solvate), crystalline form P (isopropanol solvate), crystalline form J-1 (hemisec-butyltetrahydrofuran solvate), crystalline form J-2 (
methyl isobutyl ketone solvate) and crystalline form M-2 (
acetonitrile solvate). The
solid form can be used for treating and / or preventing diseases related to
autotaxin (ATX).