[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule is a metabolite found in or produced by Escherichia coli (strain K12, MG1655)."}, {"from": "gpt", "value": "[C][=C][C][=Branch1][=Branch1][=N][C][=N][Ring1][=Branch1][N][=C][N][Ring1][Branch2]"}]