[{"from": "human", "value": "Provide a brief overview of this molecule. [C][/C][=C][/C][C][Branch2][Ring1][Branch1][C][Branch1][P][C][=C][Branch1][Ring2][O][Ring1][=Branch1][C][=Branch1][C][=C][O][C][Ring1][#Branch1][=O][O][O]"}, {"from": "gpt", "value": "The molecule is a butenolide."}]