5-Dazfep 5-Deazaflavin 4,5-epoxide 5-Deazaflavin 4a,5-epoxide 86889-50-1 D-Ribitol, 1-deoxy-1-(3,4-dihydro-8,9-dimethyl-2,4-dioxo-2H-oxireno(c)pyrimido(4,5-b)quinolin-6(10bH)-yl)-