7-[9-(4-hydroxy-5-hydroxymethyl-tetrahydrofuran-2-yl)-1,9-dihydro-purin-6-ylideneamino]-6H-benzo[f][1,3]dioxolo[4',5':4,5]benzo[1,2,3-cd]indol-5-one

7-{9-[4-(tert-butyldimethylsilanyloxy)-5-(tert-butyldimethylsilanyloxymethyl)-tetrahydrofuran-2-yl]-1,9-dihydro-purin-6-ylideneamino}-6-(tert-butyldimethylsilanyloxymethyl)-6H-benzo[f][1,3]dioxolo[4',5':4,5]benzo[1,2,3-cd]indol-5-one