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In chemistry, furantetracarboxylic acid is an organic compound with formula C8H4O9, or OH]4, which can be viewed as deriving from furan C4H4O through replacement of the four hydrogen atoms by carboxyl functional groups -OH.
By removal of four protons, the acid is expected to yield the anion C8O9, furantetracarboxylate, which is one of the oxocarbon anions [consisting solely of oxygen and carbon. By loss of 1 through 3 protons it forms the anions C8H3O9, C8H2O9, and C8HO9, called respectively trihydrogen-, dihydrogen-, and hydrogenfurantetracarboxylate. The same names are used for the corresponding esters.
The acid can be obtained by from dioxalylsuccinate.
The salt rubidium trihydrogenfurantetracarboxylate RbH3C8O9 crystallizes as white needles.