[{"from": "human", "value": "Provide a description of this molecule. [C][/C][=Branch1][=C][=C][/C][=C][Branch1][Branch2][C][=Branch1][C][=O][O][\\-Ring1][=Branch1][Cl][/C][=Branch1][C][=O][O]"}, {"from": "gpt", "value": "The molecule is a butenolide."}]