[{"from": "human", "value": "Provide a brief overview of this molecule. [C][C][=C][C@@H1][C@H1][Branch2][Ring1][O][C][C][C@][Branch2][Ring1][Ring2][C@H1][Ring1][=Branch1][C][C][=Branch1][C][=C][C@@][Ring1][=Branch1][Branch1][=Branch1][C][=Branch1][C][=O][C][O][C][C@@][Branch1][=C][C][Ring2][Ring1][Ring1][=C][C][=Branch1][C][=O][C][C][Ring1][#Branch1][C]"}, {"from": "gpt", "value": "The molecule is a steroidal progestin and antineoplastic agent which was never marketed. An acylated derivative, melengestrol acetate, is used as a growth promoter in animals."}]