5720-14-9 7-Methyl-8-ethyl-10-(1'-D-ribityl)isoalloxazine 7-Methyl-8-ethylflavin 7-Methyl-8-ethylflavine Isoalloxazine, 8-ethyl-7-methyl-10-(D-ribo-2,3,4,5-tetrahydroxypentyl)- (8CI) NSC 68758 Riboflavin, 8-demethyl-8-ethyl- (9CI)