2'-deoxy-5'-O-dimethoxytrityl-4'-C-ethyluridine

2'-deoxy-5'-O-dimethoxytrityl-4'-C-methyluridine

((3aR,5R,6S,6aR)-6-Benzyloxy-5-iodomethyl-2,2-dimethyl-tetrahydro-furo[2,3-d][1,3]dioxol-5-ylmethoxy)-tert-butyl-diphenyl-silane

4-N-benzoyl-3'-O-benzyl-5'-O-tert-butyldiphenylsilyl-4'-C-hydroxymethyl-cytidine

4-N-benzoyl-3'-O-benzyl-5'-O-tert-butyldiphenylsilyl-2'-O,4'-C-(methylenoxymethylene)cytidine