[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule is a tricarboxylic acid trianion resulting from the deprotonation of all three carboxy groups of(2Z)-4-oxobut-2-ene-1,2,4-tricarboxylate, The major species at pH 7.3. It is a conjugate base of a (2Z)-4-oxobut-2-ene-1,2,4-tricarboxylic acid."}, {"from": "gpt", "value": "[C][Branch2][Ring1][Ring1][/C][=Branch1][O][=C][/C][=Branch1][C][=O][C][=Branch1][C][=O][O-1][/C][=Branch1][C][=O][O-1][C][=Branch1][C][=O][O-1]"}]