Assertion: melanin | /r/HasProperty | id
Facets:
Source sentences:
text: Following the empirical formula (C 8 H 3 O 2 N) suggested by Mason , there are still some data on websites giving a defined stoichiometric structure  where melanin, ID: 4884931, is defined with the molecular formula C 18 H 10 O 4 N 2 , an average mass of 318.3 for the minimal unit, and the systematic name 3,8-dimethyl-2,7-dihydrobenzoisoindolo[6,5,4-cd]indole-4,5,9,10-tetrone,