O6-(4,5-diacetoxypentyl)-3',5'-O-di-tert-butyldimethylsilyl-2'-deoxyguanosine

O6-phenyl-3',5'-bis(O-tert-butyldimethylsilyl)-2'-deoxyguanosine

9-[(2R,4S,5R)-4-(tert-Butyl-dimethyl-silanyloxy)-5-(tert-butyl-dimethyl-silanyloxymethyl)-tetrahydro-furan-2-yl]-6-phenoxy-3,9-dihydro-purin-2-one

2-amino-6-(2-thiazolyl)-9-(2-deoxy-β-D-ribofuranosyl)purine