7-[6-benzyloxy-9-(4-hydroxy-5-hydroxymethyltetrahydrofuran-2-yl)-9H-purin-2-ylamino]-6H-benzo[f][1,3]dioxolo[4',5':4,5]benzo[1,2,3-cd]indol-5-one

7-{6-benzyloxy-9-[4-(tert-butyldimethylsilyloxy)-5-(tert-butyldimethylsilyloxymethyl)-tetrahydrofuran-2-yl]-9H-purin-2-ylamino}-6-(tert-butyldimethylsilyloxymethyl)-6H-benzo[f][1,3]dioxolo[4',5':4,5]benzo[1,2,3-cd]indol-5-one