5'-O-Dimethoxytrityl-O(4)-4-nitrophenylethyl-2'-O-4-nitrophenylethylsulfonyluridine

5'-O-Dimethyltritylthymidine

5'-O-Ethyl cytosine arabinoside

5'-O-Fructofuranosylpyridoxine

5'-O-Galactopyranosyl ribavirin

5'-O-Galactosyl-5-fluorouridine

5'-O-Glucopyranosyl ribavirin

5'-O-Methyl-araC

5'-O-Octanoyl AZT

5'-O-Palmitoyl-5-fluoro-2'-deoxyuridine

5'-O-Thymidyl 3'-O-(2'-deoxyadenosyl) phosphorothioate

5'-O-Thymidyl 3'-O-thymidylphosphate

5'-O-Triphosphomethyl-3-FdT

5'-O-Triphosphoryl-2-azidoadenylyl-(2'-5')-2-azidoadenylyl-(2'-5')-2-azidoadenosine

5'-O-Triphosphoryl-8-azidoadenylyl-(2'-5')-8-azidoadenylyl-(2'-5')-8-azidoadenosine

5'-O-Trityluridine

5'-Octanoyl-5-fluoro-2'-deoxyuridine

5'-Oleoyl cytarabine

5'-Palmitoyl cytarabine

5'-Phosphatidylcytidine