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Lipoic acid and related molecules. Lipoic acid is a derivative of octanoic acid in which sulfur atoms are inserted at carbon atoms 6 and 8. The two thiols form the disulfide, which is called lipoic acid (dihydrolipoic acid is the reduced form). The IUPAC names of (R)-lipoic acid and dihydrolipoic acid are (R)-5-(1,2-dithiolan-3-yl)pentanoic acid and 6,8-dimercaptooctanoic acid, respectively.
