[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is a 3-(omega-methylthio)alkylmalate(2-) obtained by deprotonation of both carboxy groups of 3-(2-methylthioethyl)malic acid; major species at pH 7.3. It is a conjugate base of a 3-(2-methylthioethyl)malic acid."}, {"from": "gpt", "value": "[C][S][C][C][C][Branch1][#Branch2][C][Branch1][=Branch1][C][=Branch1][C][=O][O-1][O][C][=Branch1][C][=O][O-1]"}]