[9-[(2R,3R,4R,5R)-3,4-Bis-(tert-butyl-dimethyl-silanyloxy)-5-(tert-butyl-dimethyl-silanyloxymethyl)-tetrahydro-furan-2-yl]-6-(2-trimethylsilanyl-ethoxy)-9H-purin-2-ylmethyl]-phosphonic acid dimethyl ester

5-amino-1-[2',3',5'-O-tris(tert-butyldimethylsilyl)-β-D-ribofuranosyl]imidazole-4-carboxamide

2-Benzyloxymethyl-9-[(2R,3R,4R,5R)-3,4-bis-(tert-butyl-dimethyl-silanyloxy)-5-(tert-butyl-dimethyl-silanyloxymethyl)-tetrahydro-furan-2-yl]-1,9-dihydro-purin-6-one

5-(2-Benzyloxy-acetylamino)-1-[(2R,3R,4R,5R)-3,4-bis-(tert-butyl-dimethyl-silanyloxy)-5-(tert-butyl-dimethyl-silanyloxymethyl)-tetrahydro-furan-2-yl]-1H-imidazole-4-carboxylic acid amide