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(left) Chemical structure of the oxidized form of the flavin isoalloxazine ring system with indication of the atom numbering. (middle) Chemical structure of the C4a-hydroperoxyflavin. (right) Chemical structure of the flavin-N5-oxide. R = ribityl (Riboflavin), ribitylphosphate (flavin mononucleotide, FMN) or ribityl-ADP (flavin adenine dinucleotide, FAD); R* = ribitylphosphate or ribityl-ADP.
