N6-benzoyl-2',3'-isopropylidene-5'-<2-butyl>-N-(tolylsulfonyl)amino>-4-<(tert-butyldiphenylsilyl)oxy>butyl>-5'-deoxyadenosine

9-(5,6-dideoxy-2,3-O-isopropylidene-β-D-ribo-heptofuranosiduronyl)adenine ethyl ester

O-isopropylidene-2',3' N-benzoyl-6 deutero-5' adenosine

N6-(α-imidazolylbenzylidene)-2',3'-isopropylidene-5'-<2--4-iodobutyl>-5'-deoxyadenosine