1-[(5R,6S,8R,9R)-4-Amino-9-[[(1,1-dimethylethyl)dimethylsilyl]oxy]-6-[[[(1,1-dimethylethyl)dimethylsilyl]oxy]methyl]-2,2-dioxido-3-phenyl-7-oxa-2-thia-1-azaspiro[4.4]non-3-en-8-yl]-5-methyl-2,4(1H,3H)-pyrimidinedione

2'-Deoxy-N-(2-furanylmethyl)-5-methylcytidine

N-[Bis(4-methoxyphenyl)phenylmethyl]-2'-C-methylcytidine

1-[(5R,6S,8R,9R)-4-Amino-9-[[(1,1-dimethylethyl)dimethylsilyl]oxy]-6-(hydroxymethyl)-1-methyl-2,2-dioxido-3-phenyl-7-oxa-2-thia-1-azaspiro[4.4]non-3-en-8-yl]-3,5-dimethyl-2,4(1H,3H)-pyrimidinedione

2',3'-O-(Methoxymethylene)-2'-C-methylguanosine

L-Valine, 3'-ester with 2'-C-methylcytidine 5'-[2-[(3-hydroxy-2,2-dimethyl-1-oxopropyl)thio]ethyl N-(phenylmethyl)phosphoramidate]

Guanosine, 2'-deoxy-2'-ethynyl-2'-fluoro-, 5'-[2-[(3-hydroxy-2,2-dimethyl-1-oxopropyl)thio]ethyl N-[[4-(trifluoromethyl)phenyl]methyl]phosphoramidate], (2'R)-

Guanosine, 2'-deoxy-2'-ethynyl-2'-fluoro-, 5'-[2-[(3-hydroxy-2,2-dimethyl-1-oxopropyl)thio]ethyl N-[(4-methoxyphenyl)methyl]phosphoramidate], (2'R)-

Guanosine, 2'-deoxy-2'-ethynyl-2'-fluoro-, 5'-[2-[(3-hydroxy-2,2-dimethyl-1-oxopropyl)thio]ethyl N-[(4-fluorophenyl)methyl]phosphoramidate], (2'R)-

Guanosine, 2'-deoxy-2'-ethynyl-2'-fluoro-, 5'-[2-[[2,2-dimethyl-1-oxo-3-(triphenylmethoxy)propyl]thio]ethyl phosphonate], (2'R)-

Guanosine, 2'-deoxy-2'-ethynyl-2'-fluoro-, 5'-[2-[(3-hydroxy-2,2-dimethyl-1-oxopropyl)thio]ethyl N-(phenylmethyl)phosphoramidate], (2'R)-

L-Valine, 3'-ester with 2'-C-methylcytidine 5'-[2-[[2,2-dimethyl-1-oxo-3-(triphenylmethoxy)propyl]thio]ethyl N-(phenylmethyl)phosphoramidate]

(2'R)-2'-Deoxy-2'-fluoro-N-(2-methyl-1-oxopropyl)-3',5'-O-[1,1,3,3-tetrakis(1-methylethyl)-1,3-disiloxanediyl]-2'-[2-(trimethylsilyl)ethynyl]guanosine

N-[6,9-Dihydro-6-oxo-9-[3,5-O-[1,1,3,3-tetrakis(1-methylethyl)-1,3-disiloxanediyl]-2-C-[2-(trimethylsilyl)ethynyl]-β-D-arabinofuranosyl]-1H-purin-2-yl]-2-methylpropanamide

Guanosine, 2'-deoxy-2'-ethynyl-2'-fluoro-, 5'-[2-[[2,2-dimethyl-1-oxo-3-(triphenylmethoxy)propyl]thio]ethyl N-(phenylmethyl)phosphoramidate], (2'R)-

(2'R)-2'-Deoxy-2'-ethynyl-2'-fluoro-N-(2-methyl-1-oxopropyl)guanosine

Guanosine, 2'-deoxy-2'-ethynyl-2'-fluoro-, 5'-[2-[[2,2-dimethyl-1-oxo-3-(triphenylmethoxy)propyl]thio]ethyl N-[(4-methoxyphenyl)methyl]phosphoramidate], (2'R)-

Guanosine, 2'-deoxy-2'-ethynyl-2'-fluoro-, 5'-[2-[[2,2-dimethyl-1-oxo-3-(triphenylmethoxy)propyl]thio]ethyl N-[(4-fluorophenyl)methyl]phosphoramidate], (2'R)-

6-Chloro-9-[(2R)-2-deoxy-2-fluoro-3,5-O-[1,1,3,3-tetrakis(1-methylethyl)-1,3-disiloxanediyl]-2-[2-(trimethylsilyl)ethynyl]-β-D-erythro-pentofuranosyl]-9H-purine

6-Chloro-9-[3,5-O-[1,1,3,3-tetrakis(1-methylethyl)-1,3-disiloxanediyl]-2-C-[2-(trimethylsilyl)ethynyl]-β-D-ribofuranosyl]-9H-purine