[{"from": "human", "value": "What can you tell me about this molecule? [C][C@][C][C][C@H1][C@H1][Branch1][#Branch2][C@@H1][Ring1][=Branch1][C][C][C][Ring1][=Branch2][=O][C][C][=Branch1][C][=C][C][=C][C][=Branch1][C][=O][C][=C][C@][Ring1][P][Ring1][#Branch1][C]"}, {"from": "gpt", "value": "The molecule is a steroidal inhibitor of aromatase which effectively blocks estrogen synthesis in postmenopausal women and is used as therapy of estrogen receptor positive breast cancer, usually after resection and after failure of tamoxifen. Exemestane has been associated with a low rate of serum enzyme elevations during therapy and rare instances of clinically apparent liver injury."}]