[{"from": "human", "value": "Please give me some details about this molecule. [C][=C][C][C][=Branch1][C][=O][C][=Branch1][C][=O][O-1]"}, {"from": "gpt", "value": "The molecule is a 2-oxo monocarboxylic acid anion. It is functionally related to a pent-4-enoate. It is a conjugate base of a 2-oxopent-4-enoic acid. It is a tautomer of a 2-hydroxypenta-2,4-dienoate."}]