[{"from": "human", "value": "Generate a molecule based on this description. The molecule is a 2-oxo monocarboxylic acid. It is functionally related to a hex-4-enoic acid. It is a conjugate acid of a 2-oxohex-4-enoate."}, {"from": "gpt", "value": "[C][/C][=C][/C][C][=Branch1][C][=O][C][=Branch1][C][=O][O]"}]