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Eumelanins are deep black, polyphenolic polymers obtained from Dopa 1 or dopamine 2 and containing indole or dihydroindole units, respectively. They are formed by intramolecular addition of the amino groups to the o-quinones generated by oxidation. The results of solid-state 13C NMR spectroscopy confirm the suggested route of formation of eumelanins.
Peter et al. (Thu,) studied this question.