131247-49-9 5,6,7,7a,9,10,14b,14c-Octahydro-4-(2,3-O-(1-methylethylidene)-ribofuranosyl)cyclopenta(4,5)pyrimido(5',4':3,4)pyrrolo(2,1-a)isoquinoline-1,3(2H,4H)-dione Omrcppi