1-<2,3-bis-O-(tert-butyldimethylsilyl)-4α-<(4,4'-dimethoxytrityl)oxymethyl>-β-D-ribo-pentofuranosyl>uracil

4S-(1R,4S,8S,11R)-{9-N-(3-tert-butoxycarbonylaminopropyl)-4,9-aza-10-oxa-1-oxobicyclo[6,3,0]undecan-11-yl}-2,3-di-O-tert-butyldimethylsilyl-1-(uracyl-1-yl)-β-D-erythro-furanose

1-[10-azido-2,3-di-O-(tert-butyldimethylsilyl)-6,10,11-trideoxy-8,9-O-isopropylidene-11-S-phenyl-11-thio-L-galacto-D-allo-undecofuranosyl-(1,4)]uracil

1-[10-azido-2,3-di-O-(tert-butyldimethylsilyl)-6,10,11-trideoxy-8,9-O-isopropylidene-11-phenylsulfinyl-L-galacto-D-allo-undecofuranosyl-(1,4)]uracil