[{"from": "human", "value": "Provide a description of this molecule. [C][Branch1][#C][C][=Branch1][#Branch1][=C][C][=Branch1][C][=O][O-1][C][=Branch1][C][=O][O-1][C][=Branch1][C][=O][O-1]"}, {"from": "gpt", "value": "The molecule is a tricarboxylic acid trianion that is the conjugate base of aconitic acid. It is a conjugate base of an aconitic acid."}]