[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is the cis-isomer of aconitic acid. It has a role as a fundamental metabolite. It is a conjugate acid of a cis-aconitate(3-)."}, {"from": "gpt", "value": "[C][Branch1][#C][/C][=Branch1][#Branch1][=C][/C][=Branch1][C][=O][O][/C][=Branch1][C][=O][O][C][=Branch1][C][=O][O]"}]