[{"from": "human", "value": "Use the given information to create a molecule that fulfills the desired purpose. The molecule is the dicarboxylate anion of (S)-methylsuccinic acid; major species at pH 7.3. It is a conjugate base of a (S)-methylsuccinic acid."}, {"from": "gpt", "value": "[C][C@@H1][Branch1][#Branch1][C][C][=Branch1][C][=O][O-1][C][=Branch1][C][=O][O-1]"}]