5'-O-[[Bis[2-[(2,2-dimethyl-1-oxopropyl)thio]ethoxy]phosphinyl]methyl]-2'-O-(2-methoxyethyl)-5-methyluridine

3'-[(Acetyloxy)methyl]-2',3'-dideoxy-5'-O-[(1,1-dimethylethyl)diphenylsilyl]-2'-fluorouridine

3'-Deoxy-6-S-(2-hydroxyethyl)-3'-(hydroxymethyl)-6-thioguanosine

3'-(Cyanomethyl)-3'-deoxyuridine

3'-(Azidomethyl)-3'-deoxyuridine

3'-[(Acetyloxy)methyl]-2',3'-dideoxy-2'-fluorouridine 5'-(tetrahydrogen triphosphate)

3'-[(Acetyloxy)methyl]-2',3'-dideoxy-2'-fluorouridine

3'-(Cyanomethyl)-3'-deoxyuridine 5'-(tetrahydrogen triphosphate)

3'-(Azidomethyl)-3'-deoxyuridine 5'-(tetrahydrogen triphosphate)

3'-(Aminomethyl)-3'-deoxyuridine 5'-(tetrahydrogen triphosphate)

5-[3-([2,2'-Bipyridin]-5-ylmethoxy)-1-propyn-1-yl]-5'-O-[bis(4-methoxyphenyl)phenylmethyl]-2'-deoxyuridine

3'-Deoxy-3'-(hydroxymethyl)-5-methyluridine 5'-(tetrahydrogen triphosphate)

3'-[(Acetyloxy)methyl]-2',3'-dideoxyuridine 5'-(tetrahydrogen triphosphate)

3'-[(Acetyloxy)methyl]-2',3'-dideoxyguanosine

3'-[(Acetyloxy)methyl]-2',3'-dideoxyuridine

5-[4-([2,2'-Bipyridin]-5-ylmethoxy)-1-butyn-1-yl]-2'-deoxyuridine

5-[3-([2,2'-Bipyridin]-5-ylmethoxy)-1-propyn-1-yl]-2'-deoxyuridine

5'-O-[Bis(4-methoxyphenyl)phenylmethyl]-5-[6-([2,2'-bipyridin]-5-ylmethoxy)-1-hexyn-1-yl]-2'-deoxyuridine

5-[5-([2,2'-Bipyridin]-5-ylmethoxy)-1-pentyn-1-yl]-5'-O-[bis(4-methoxyphenyl)phenylmethyl]-2'-deoxyuridine

5-[4-([2,2'-Bipyridin]-5-ylmethoxy)-1-butyn-1-yl]-5'-O-[bis(4-methoxyphenyl)phenylmethyl]-2'-deoxyuridine