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Quinic acid, which is present in cranberries, is metabolized by the body into hippuric acid, a substance that in very high concentrations is toxic to E. coli, the pathogen most commonly to blame for U.T.I.s.

To prevent the formation of uric acid Robin prescribes quinic acid combined with formine or urotropine.

In 1838 Woskresensky, by oxidizing quinic acid with sulphuric acid and oxide of manganese, obtained a crystalline substance which he called quinoyl.

Hydroquinone was obtained by Caventou and Pelletier by heating quinic acid, but these chemists did not recognize its true nature.

In the case of hydroquinone, the original source, quinic acid, was obviously out of question, for economical reasons.