2-O-[(tert-butyl)dimethylsilyl]-1-deoxy-5-O-(4,4'-dimethoxytrityl)-D-ribofuranose

2(R)-(tert-butyldimethylsilyloxymethyl)-4(R)-azidotetrahydrofuran-3(S)-ol

1,4-anhydro-3-chloroacetyl-2-O-(4,4'-dimethoxytrityl)-D-ribitol

1,4-anhydro-5-O-[diisopropyl(hydroxy)silyloxy(diisopropyl)silyl]-2-O-(4,4'-dimethoxytrityl)-D-ribitol

1,4-anhydro-3-chloroacetyl-5-O-[diisopropyl(hydroxy)silyloxy(diisopropyl)silyl]-2-O-(4,4'-dimethoxytrityl)-D-ribitol