1-[5-O-[(2-Chlorophenoxy)hydroxyphosphinyl]-β-D-arabinofuranosyl]-5-(1-propyn-1-yl)-2,4(1H,3H)-pyrimidinedione

1-[5-O-[Hydroxy(4-methoxyphenoxy)phosphinyl]-β-D-arabinofuranosyl]-5-(1-propyn-1-yl)-2,4(1H,3H)-pyrimidinedione

1-[5-O-[Hydroxy(2,2,2-trifluoroethoxy)phosphinyl]-β-D-arabinofuranosyl]-5-(1-propyn-1-yl)-2,4(1H,3H)-pyrimidinedione

1-[5-O-[(Hexadecyloxy)hydroxyphosphinyl]-β-D-arabinofuranosyl]-5-(1-propyn-1-yl)-2,4(1H,3H)-pyrimidinedione

N-[7-[9-(2-Deoxy-β-D-erythro-pentofuranosyl)-9H-purin-6-yl]-5-phenyl-7-azabicyclo[4.1.0]hepta-2,4-dien-2-yl]acetamide

N-[7-[9-(2-Deoxy-β-D-erythro-pentofuranosyl)-9H-purin-6-yl]-4-phenyl-7-azabicyclo[4.1.0]hepta-2,4-dien-1-yl]acetamide

1-[5-O-[(2,6-Dimethylphenoxy)hydroxyphosphinyl]-β-D-arabinofuranosyl]-5-(1-propyn-1-yl)-2,4(1H,3H)-pyrimidinedione

1-[5-O-[(4-Fluorophenoxy)hydroxyphosphinyl]-β-D-arabinofuranosyl]-5-(1-propyn-1-yl)-2,4(1H,3H)-pyrimidinedione

N-[7-[9-(2-Deoxy-β-D-erythro-pentofuranosyl)-9H-purin-6-yl]-6-phenyl-7-azabicyclo[4.1.0]hepta-2,4-dien-3-yl]acetamide

1-[3-[(Z)-Butylideneoxidoamino]-2,3-dideoxy-5-O-[(1,1-dimethylethyl)dimethylsilyl]-β-L-erythro-pentofuranosyl]-5-methyl-2,4(1H,3H)-pyrimidinedione

1-[5-O-[(4-Chlorophenoxy)hydroxyphosphinyl]-β-D-arabinofuranosyl]-5-(1-propyn-1-yl)-2,4(1H,3H)-pyrimidinedione

5,6-Dichloro-1-(2-deoxy-β-D-erythro-pentofuranosyl)-2-(1-methylethyl)-1H-benzimidazole

5,6-Dichloro-1-(2-deoxy-β-D-erythro-pentofuranosyl)-2-methyl-1H-benzimidazole

5,6-Dibromo-1-(2-deoxy-β-D-erythro-pentofuranosyl)-1H-benzimidazole

5,6-Dichloro-1-(2-deoxy-β-D-erythro-pentofuranosyl)-2-(trifluoromethyl)-1H-benzimidazole

1-[5-O-[Hydroxy(2,2,2-trichloroethoxy)phosphinyl]-β-D-arabinofuranosyl]-5-(1-propyn-1-yl)-2,4(1H,3H)-pyrimidinedione

1-[5-O-(Ethoxyhydroxyphosphinyl)-β-D-arabinofuranosyl]-5-(1-propyn-1-yl)-2,4(1H,3H)-pyrimidinedione

Thymidylyl-(3'→5')-2',6-dideoxyguanosine

1-(2-Deoxy-β-D-erythro-pentofuranosyl)-5,6-difluoro-1H-benzimidazole

Uridine, 2'-deoxy-3',5'-bis-O-(1,3-dimethyl-2-sulfido-1,3,2-diazaphospholidin-2-yl)-5-fluoro-