208993-54-8 8-Phenyl-3-(4-((3aR,9bR)-1,3a,4,9b-tetrahydro-9-methoxy(1)benzopyrano(3,4-c)pyrrol-2(3H)-yl)butyl)pyrazino(2',3':4,5)thieno(3,2-d)pyrimidine-2,4(1H,3H)-dione. Fiduxosin Fiduxosin [INN]