(3aR,4R,11R,11aR)-8-Ethoxy-3a,10,11,11a-tetrahydro-2,2-dimethyl-4,11-epoxy-1,3-dioxolo[4,5-e]pyrimido[1,6-a]azepin-6(4H)-one

Uridine, 5′-deoxy-4-O-ethyl-5′-iodo-2′,3′-O-(1-methylethylidene)-

Uridine, 5′-O-[(1,1-dimethylethyl)dimethylsilyl]-2′,3′-O-(1-methylethylidene)-6-(trimethylsilyl)-

Guanosine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-N-(2-pyridinylcarbonyl)-

Adenosine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-N-(2-pyridinylcarbonyl)-

Guanosine, 2′-deoxy-N-(2-pyridinylcarbonyl)-

Cytidine, 3′-methanesulfonate

Cytidine, 2′,5′-bis-O-(triphenylmethyl)-, 3′-methanesulfonate

Thymidine, α-[(aminothioxomethyl)hydrazono]-

Cytidine, N-acetyl-2′,5′-di-O-trityl-, 3′-methanesulfonate

Thymidine, α-bromo-5-(bromomethyl)-5,6-dihydro-, 3′,5′-diacetate

2′,5′-Bis-O-(triphenylmethyl)cytidine

Uridine 3′-decanoate 2′,5′-dimethanesulfonate

Uridine 2′,5′-diacetate 3′-decanoate

3′-O-Decanoyluridine

Uridine 2′,5′-dimethanesulfonate 3′-octanoate

Uridine 2′,5′-diacetate 3′-octanoate

Uridine 3′-octanoate

Uridine 3′-hexanoate 2′,5′-dimethanesulfonate

Uridine 2′,5′-diacetate 3′-hexanoate