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.
No takes yet. Share an insight, caveat, or question.
Peter et al. (1989) studied this question.
Synapse has enriched 4 closely related papers on similar clinical questions. Consider them for comparative context: