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Napolitano A, Di Donato P, Prota G. Zinc-Catalyzed Oxidation of 5-S-Cysteinyldopa to 2,2‘-Bi(2H-1,4-benzothiazine): Tracking the Biosynthetic Pathway of Trichochromes, the Characteristic Pigments of Red Hair. J. Org. Chem. 2001 Sep 27;66(21):6958–66. doi: 10.1021/jo010320g. |