O4-(4-nitrophenylsulfonylethyl)uridine

1-((2R,3R,3aS,9aR)-5,5,7,7-Tetra-tert-butoxy-3-hydroxy-tetrahydro-1,4,6,8-tetraoxa-5,7-disila-cyclopentacycloocten-2-yl)-1H-pyrimidine-2,4-dione

3'-O-(4-methoxytetrahydropyran-4-yl)-cytidine

2'-O-(2-cyanoethyl)uridine