Benzoquinonetetracarboxylic acid
In chemistry, 1,4-benzoquinonetetracarboxylic acid is an organic compound with formula, or 4, which can be viewed as deriving from para-benzoquinone 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, benzoquinonetetracarboxylate, which is one of the oxocarbon anions via dinitropyromellitic and
diaminopyromellitic acids.