[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is the 2-(2-methylthioethyl) derivative of malic acid. It is a conjugate acid of a 2-(2-methylthioethyl)malate(2-)."}, {"from": "gpt", "value": "[C][S][C][C][C][Branch1][#Branch1][C][C][=Branch1][C][=O][O][Branch1][=Branch1][C][=Branch1][C][=O][O][O]"}]