High Quality Content by WIKIPEDIA articles! Squaric acid, also called quadratic acid, because its four carbon atoms approximately form a square, is an organic compound with chemical formula C4H2O4. The conjugate base of squaric acid is the hydrogensquarate anion C4HO4?; and the conjugate base of the later is the divalent squarate anion C4O42?. This is one of the oxocarbon anions, which consist only of carbon and oxygen. Squaric acid is a reagent for chemical synthesis, used for instance to make photosensitive squaraine dyes and inhibitors of protein tyrosine phosphatases.

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