1,2-O-isopropylidene-α-D-ribo-hexofuranose-3-spiro-3'-(4'-amino-2'-N-benzyl-5'-phenyl-5'H-2',3'-dihydroisothiazole-1',1'-dioxide)

(3R)-3,3-(1,3-diazaspiro-2,4-dioxo)-5-O-trityl-1,2-O-isopropylidene-α-D-ribofuranose

N-phenyloxycarbonyl-3-amino-3-C-cyano-3-deoxy-5-O-trityl-1,2-O-isopropylidene-α-D-ribofuranose

3-amino-3-C-cyano-3-deoxy-1,2-O-isopropylidene-3-N-methyl-3-N-phenylmethanesulfonyl-5-O-trityl-α-D-ribofuranose

3-amino-3-N-benzyl-3-C-cyano-3-deoxy-1,2-O-isopropylidene-3-N-methanesulfonyl-5-O-trityl-α-D-ribofuranose