[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is a metabolite found in or produced by Escherichia coli (strain K12, MG1655)."}, {"from": "gpt", "value": "[C][C][=Branch1][C][=O][C][Branch1][C][C][Branch1][=Branch1][C][=Branch1][C][=O][O][O]"}]