3-(2'-deoxyribofuranosyl)-9-ribofuranosyl-3H-pyrimido(1'',6''-1',2')imidazo(4',5'-4,5)imidazo(2,1-i)purin-8(9H)-one
3-(2'-deoxyribofuranosyl)-9-ribofuranosyl-3h-pyrimido(1'',6''-1',2')imidazo(4',5'-4,5)imidazo(2,1-i)purin-8(9h)-one