[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is the carboxymethoxy derivative of succinic acid. It is functionally related to a succinic acid. It is a conjugate acid of a 2-(carboxylatomethoxy)succinate(3-)."}, {"from": "gpt", "value": "[C][Branch1][S][C][Branch1][=Branch1][C][=Branch1][C][=O][O][O][C][C][=Branch1][C][=O][O][C][=Branch1][C][=O][O]"}]