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In page Melanin:

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It is now understood that melanins do not have a single structure or stoichiometry.[citation needed] Nonetheless, chemical databases such as PubChem include structural and empirical formulae; typically 3,8-Dimethyl-2,7-dihydrobenzo[1,2,3-cd:4,5,6-c′d′]diindole-4,5,9,10-tetrone. This can be thought of as a single monomer that accounts for the measured elemental composition and some properties of melanin, but is unlikely to be found in nature.[1] Solano[1] claims that this misleading trend stems from a report of an empirical formula in 1948,[2] but provides no other historical detail.