[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is a dicarboxylic acid dianion obtained by deprotonation of the carboxy groups of 2-hydroxyhepta-2,4-dienedioic acid; major species at pH 7.3. It is a conjugate base of a 2-hydroxyhepta-2,4-dienedioic acid. It is a tautomer of a 2-oxohept-4-ene-1,7-dioate."}, {"from": "gpt", "value": "[C][Branch1][=N][/C][=C][/C][=C][Branch1][=Branch1][/C][=Branch1][C][=O][O][\\O-1][C][=Branch1][C][=O][O-1]"}]