[{"from": "human", "value": "Could you provide a description of this molecule? [C][=C][C][=Branch1][C][=O][O][/C][\\-Ring1][=Branch1][=C][\\C][=Branch1][C][=O][C][=Branch1][C][=O][O]"}, {"from": "gpt", "value": "The molecule is a 2-oxo monocarboxylic acid that is pyruvic acid substituted at position 3 by a 5-oxofuran-2-ylidene group. It is a 2-oxo monocarboxylic acid and a butenolide. It is functionally related to a pyruvic acid. It is a conjugate acid of a 2-oxo-3-(5-oxofuran-2-ylidene)propanoate."}]