[{"from": "human", "value": "Provide a description of this molecule. [C][S][C][C][C][Branch1][#Branch1][C][C][=Branch1][C][=O][O-1][Branch1][=Branch1][C][=Branch1][C][=O][O-1][O]"}, {"from": "gpt", "value": "The molecule is dicarboxylate anion of 2-(2-methylthioethyl)malic acid. It is a conjugate base of a 2-(2-methylthioethyl)malic acid."}]