2-Amino-9-[(2R,3R,4R,5R)-3,4-bis-(tert-butyl-dimethyl-silanyloxy)-5-hydroxymethyl-tetrahydro-furan-2-yl]-9H-purin-6-ol

2',3'-O-bis[(tert-butyl)dimethylsilyl]-2-N-(4,4'-dimethoxytrityl)guanosine

5'-O-<bis(2,2,2-trichloroethyloxy)-phosphoryl>-2',3'-di-O-silylguanosine

2',3'-O-di-tert-butyldimethylsilyl-2-N-(4,4'-dimethoxytrityl)guanosine 5'-[ethyl N-(N-trityl-L-prolyl)phosphoroamidate]

((2R,3S,4R,5R)-5-(2-amino-6-oxo-1,6-dihydro-9H-purin-9-yl)-3,4-dihydroxytetrahydrofuran-2-yl)methyl (L-isoleucyl)sulfamate

((2R,3R,4R,5R)-5-(2-amino-6-oxo-1,6-dihydro-9H-purin-9-yl)-3,4-bis((tert-butyldimethylsilyl)oxy)tetrahydrofuran-2-yl)methyl sulfamate