[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is dicarboxylate anion of 2-formylglutaric acid. It is a conjugate base of a 2-formylglutaric acid."}, {"from": "gpt", "value": "[C][Branch1][#Branch1][C][C][=Branch1][C][=O][O-1][C][Branch1][Ring1][C][=O][C][=Branch1][C][=O][O-1]"}]