[{"from": "human", "value": "Provide a description of this molecule. [C][Branch1][N][C][=Branch1][C][=O][/C][=C][/C][=Branch1][C][=O][O][C][=Branch1][C][=O][O]"}, {"from": "gpt", "value": "The molecule is a 4-oxohex-2-enedioic acid. It is a conjugate acid of a fumarylacetate."}]