[{"from": "human", "value": "Generate a molecule based on the given description. The molecule is an aldehydic acid. It has a role as an Escherichia coli metabolite and a mouse metabolite. It is a conjugate acid of a 4-oxobutanoate."}, {"from": "gpt", "value": "[C][Branch1][#Branch1][C][C][=Branch1][C][=O][O][C][=O]"}]