[{"from": "human", "value": "Create a molecule that satisfies the conditions outlined in the description. The molecule is a dicarboxylic acid dianion obtained by deprotonation of the carboxy groups of 2-oxohept-4-ene-1,7-dioic acid; major species at pH 7.3. It is a conjugate base of a 2-oxohept-4-ene-1,7-dioic acid. It is a tautomer of a 2-hydroxyhepta-2,4-dienedioate."}, {"from": "gpt", "value": "[C][Branch1][=Branch2][/C][=C][/C][C][=Branch1][C][=O][O-1][C][=Branch1][C][=O][C][=Branch1][C][=O][O-1]"}]