[{"from": "human", "value": "Could you provide a description of this molecule? [C][=C][C][C][C@][Branch2][Ring2][Ring2][C@H1][C][C][=C][C@][Ring1][=Branch1][Branch1][S][C@H1][Ring1][#Branch2][O][C][Ring1][Branch1][=C][Branch1][Branch1][C][=C][Ring1][=Branch2][O][C][C][N][Ring1][#C][C][C][C][C][Ring1][Ring1][O]"}, {"from": "gpt", "value": "The molecule is an Opioid Antagonist. The mechanism of action of nalmefene is as an Opioid Antagonist."}]