[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule is a 4,6-dioxohept-2-enedioate. It is a conjugate base of a 3-fumarylpyruvic acid."}, {"from": "gpt", "value": "[C][Branch1][N][C][=Branch1][C][=O][/C][=C][/C][=Branch1][C][=O][O-1][C][=Branch1][C][=O][C][=Branch1][C][=O][O-1]"}]