L-Alanine, N-phosphono-, 1-[2-(hexyloxy)ethyl] ester, cyclic (P→3',5')-ester with 2'-C-methylcytidine

L-Alanine, N-phosphono-, 1-(2-propylpentyl) ester, cyclic (P→3',5')-ester with 2'-C-methylcytidine

L-Alanine, N-[P(S)]-phosphono-, 1-butyl ester, cyclic (P→3',5')-ester with 2'-C-methylcytidine

L-Alanine, N-[P(R)]-phosphono-, 1-heptyl ester, cyclic (P→3',5')-ester with 2'-C-methylcytidine

L-Alanine, N-[P(S)]-phosphono-, 1-heptyl ester, cyclic (P→3',5')-ester with 2'-C-methylcytidine

L-Alanine, N-[P(R)]-phosphono-, 1-butyl ester, cyclic (P→3',5')-ester with 2'-C-methylcytidine

L-Alanine, N-[P(S)]-phosphono-, 1-ethyl ester, cyclic (P→3',5')-ester with 2'-C-methylcytidine

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

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]-3-ethyl-5-methyl-2,4(1H,3H)-pyrimidinedione

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]-3,5-dimethyl-2,4(1H,3H)-pyrimidinedione

1-[(5R,6S,8R,9R)-4-Amino-9-[[(1,1-dimethylethyl)dimethylsilyl]oxy]-6-(hydroxymethyl)-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

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

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

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)-