1-[(1S,4R,6R,7R,8R)-7-Hydroxy-1-methyl-8-(phenylmethoxy)-2-(phenylmethyl)-5-oxa-2-azaspiro[3.4]oct-6-yl]-2,4(1H,3H)-pyrimidinedione

1-[(1S,4R,6R,7R,8R)-7-Hydroxy-1-methyl-8-(phenylmethoxy)-5-oxa-2-thiaspiro[3.4]oct-6-yl]-2,4(1H,3H)-pyrimidinedione

1-[(1S,4R,6R,7R,8R)-2-Ethyl-7,8-dihydroxy-1-methyl-5-oxa-2-azaspiro[3.4]oct-6-yl]-2,4(1H,3H)-pyrimidinedione

1-[(2R,3R,3aR,6aS)-Tetrahydro-2H-3,6a-(epoxymethano)furo[3,2-b]furan-2-yl]-2,4(1H,3H)-pyrimidinedione

1-[(2R,3R,4R,5R)-3-(Acetyloxy)-4-(phenylmethoxy)-1-oxa-7-thiaspiro[4.4]non-2-yl]-2,4(1H,3H)-pyrimidinedione

1-[(2R,3R,4R,5R)-3-Hydroxy-4-(phenylmethoxy)-1-oxa-7-thiaspiro[4.4]non-2-yl]-2,4(1H,3H)-pyrimidinedione

2,4(1H,3H)-Pyrimidinedione, 1-[2-C-[(acetyloxy)methyl]-3,5-O-[1,1,3,3-tetrakis(1-methylethyl)-1,3-disiloxanediyl]-β-D-arabinofuranosyl]-

2,4(1H,3H)-Pyrimidinedione, 1-[2-C-[(acetyloxy)methyl]-3,5-O-[1,1,3,3-tetrakis(1-methylethyl)-1,3-disiloxanediyl]-β-D-arabinofuranosyl]-5-bromo-

2,4(1H,3H)-Pyrimidinedione, 1-[2-C-(hydroxymethyl)-3,5-O-[1,1,3,3-tetrakis(1-methylethyl)-1,3-disiloxanediyl]-β-D-arabinofuranosyl]-

6-Amino-9-(2-deoxy-4-C-ethynyl-2-fluoro-β-D-arabinofuranosyl)-3,9-dihydro-2H-purin-2-one

9-(2-Deoxy-4-C-ethynyl-2-fluoro-β-D-arabinofuranosyl)-9H-purine-2,6-diamine

3-Ethynyl-1-[2,3,5-tris-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-ribofuranosyl]-1H-1,2,4-triazole

3-Ethynyl-1-β-D-ribofuranosyl-1H-1,2,4-triazole

3'-Azido-2',3'-dideoxy-5-(2-iodoethynyl)-5'-O-[(4-methoxyphenyl)diphenylmethyl]uridine

1-(2-Deoxy-2-fluoro-4-C-methyl-β-D-arabinofuranosyl)-2,4(1H,3H)-pyrimidinedione

1-(2-Deoxy-2-fluoro-4-C-methyl-β-D-arabinofuranosyl)-5-fluoro-2,4(1H,3H)-pyrimidinedione

9-(2-Deoxy-4-C-ethynyl-2-fluoro-β-D-arabinofuranosyl)-6-fluoro-9H-purine

9-(2-Deoxy-4-C-ethynyl-2-fluoro-β-D-arabinofuranosyl)-6-fluoro-1,9-dihydro-2H-purin-2-one

9-(2-Deoxy-4-C-ethynyl-2-fluoro-β-D-arabinofuranosyl)-6-fluoro-9H-purin-2-amine

1-[2-Deoxy-5-O-(triphenylmethyl)-β-D-threo-pentofuranosyl]-5-fluoro-2,4(1H,3H)-pyrimidinedione