[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is a dicarboxylic acid dianion obtained by deprotonation of both carboxy groups of 3-methylmalic acid; major microspecies at pH 7.3 It has a role as a human metabolite. It is a conjugate base of a 3-methylmalic acid."}, {"from": "gpt", "value": "[C][C][Branch1][#Branch2][C][Branch1][=Branch1][C][=Branch1][C][=O][O-1][O][C][=Branch1][C][=O][O-1]"}]