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Oxidation of epinephrine and norepinephrine. Oxidation of epinephrine (R = methyl group) and norepinephrine (R = H) results in their corresponding quinones. These quinones also cyclize and get oxidized to form iminochromes. The iminochromes upon conversion to quinone methide easily isomerize and produce adrenolutin/noradrenolutin, which will also form melanin pigment eventually.
