5'-O-(tert-butyldimethylsilyl)-N2-isobutyryl-3'-tritylamino-2',3'-dideoxyguanosine

Diphenyl-carbamic acid 9-[(2R,4S,5S)-5-(tert-butyl-dimethyl-silanyloxymethyl)-4-(trityl-amino)-tetrahydro-furan-2-yl]-2-isobutyrylamino-9H-purin-6-yl ester

3-O-benzoyl-2-desoxyxyloguanosine

3'-azido-5'-O-tert-butyldimethylsilyl-N2-isobutyryl-2',3'-dideoxyguanosine

N2-isobutyryl-5'-O-tert-butyldimethylsilyl-2'-deoxyxyloguanosine