[{"from": "human", "value": "What can you tell me about this molecule? [C][C@H1][C][C@@H1][C@H1][Branch2][Ring1][#Branch1][C][C][C@][Branch1][P][C@H1][Ring1][=Branch1][C][C][C@@][Ring1][Branch1][Branch1][=Branch1][C][=Branch1][C][=O][C][O][C][C@@][Branch1][=C][C][Ring2][Ring1][C][=C][C][=Branch1][C][=O][C][C][Ring1][#Branch1][C]"}, {"from": "gpt", "value": "The molecule is a synthetic derivative of progesterone administered as an acetate salt (medroxyprogesterone acetate) with antiestrogenic activity. As a do all progestins, medroxyprogesterone binds to and activates nuclear receptors which subsequently bind to and activate target genes for transcription. As an antiestrogen, this agent may inhibit the growth-stimulating effects of estrogen on estrogen-sensitive tumor cells. (NCI04)"}]