[{"from": "human", "value": "Provide a description of this molecule. [C][C][=Branch1][C][=O][C@][Branch2][Ring2][Branch2][C][C][C@@H1][C@@][Ring1][Branch1][Branch2][Ring1][=C][C][C][C@H1][C@H1][Ring1][=Branch1][C][=C][Branch2][Ring1][C][C][=C][C][=Branch1][C][=O][C@@H1][C][C@@H1][Ring1][Ring1][C@][Ring1][N][Ring1][Branch2][C][Cl][C][O]"}, {"from": "gpt", "value": "The molecule is a synthetic steroidal anti-androgen with antineoplastic activity. Cyproterone, in its acetate form, binds the androgen receptor (AR), thereby preventing androgen-induced receptor activation and inhibiting the growth of testosterone-sensitive tumor cells.  This agent also exerts progesterogenic activity, resulting in a reduction in testicular androgen secretion and total androgen blockade. (NCI04)"}]