[{"from": "human", "value": "What can you tell me about this molecule? [C][=C][C][=Branch1][C][=O][O][/C][\\-Ring1][=Branch1][=C][\\C][=Branch1][C][=O][O]"}, {"from": "gpt", "value": "The molecule is a 4-carboxymethylenebut-2-en-4-olide."}]