[{"from": "human", "value": "Please give me some details about this molecule. [C][=Branch1][#Branch2][=C][Branch1][=Branch1][/C][=Branch1][C][=O][O][\\O-1][Branch1][=Branch1][\\C][=Branch1][C][=O][O][/O-1]"}, {"from": "gpt", "value": "The molecule is a C4-dicarboxylate resuting from deprotonation of both carboxy groups of dihydroxyfumaric acid. It is functionally related to a fumarate(2-). It is a conjugate base of a dihydroxyfumaric acid."}]