[{"from": "human", "value": "Provide a description of this molecule. [C][Branch1][S][C][/C][=Branch1][#Branch1][=C][/C][=Branch1][C][=O][O-1][/C][=Branch1][C][=O][O-1][C][C][=Branch1][C][=O][O-1]"}, {"from": "gpt", "value": "The molecule is a tricarboxylic acid trianion obtained by deprotonation of the three carboxy groups of cis-dihomoaconitic acid; major species at pH 7.3. It is a conjugate base of a cis-dihomoaconitic acid."}]