[{"from": "human", "value": "Provide a description of this molecule. [C][C][N][C][C][N][Branch1][Branch1][C][C][Ring1][=Branch1][C][C][=C][N][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][N][C][=N][C][=C][Branch2][Ring1][P][C][=Branch1][Ring2][=N][Ring1][=Branch1][C][=C][C][=C][Branch1][Branch2][C][=Branch1][Ring2][=C][Ring1][=Branch1][F][N][=C][Branch1][=Branch2][N][Ring1][Branch2][C][Branch1][C][C][C][C][F]"}, {"from": "gpt", "value": "The molecule is a unique cyclin-dependent kinase inhibitor that is used in combination with an antiestrogen in the treatment of postmenopausal women with metastatic breast cancer. Abemaciclib is associated with a moderate rate of serum aminotransferase elevations during therapy and is suspected to be a rare cause of clinically apparent liver injury."}]