[{"from": "human", "value": "Provide a brief overview of this molecule. [C][C][Branch1][C][C][C][C][=Branch1][C][=O][C][C@@][Branch1][P][C][C][C@@H1][Branch1][Ring2][O][Ring1][Branch1][C][=C][C][O][C][Ring1][Branch1][=O][C]"}, {"from": "gpt", "value": "The molecule is a butenolide."}]