1-[(5aR,7R,8R,8aS)-8-(Acetyloxy)-5a,7,8,8a-tetrahydro-5H,10H-furo[2,3-f]tetrazolo[5,1-c][1,4]oxazepin-7-yl]-2,4(1H,3H)-pyrimidinedione

6-Ethynyl-9-[2,3,5-tris-O-(4-methylbenzoyl)-β-D-ribofuranosyl]-9H-purine

1-(2,3,5-Tri-O-acetyl-β-L-ribofuranosyl)-2,4(1H,3H)-pyrimidinedione

5-Methyl-1-[(1R,3R,4S,5R)-4-(phenylmethoxy)-3-[(phenylmethoxy)methyl]-6-(1-pyrenylcarbonyl)-2-oxa-6-azabicyclo[3.2.0]hept-1-yl]-2,4(1H,3H)-pyrimidinedione

1-[(1R,5R,7R,8S)-8-Hydroxy-5-(hydroxymethyl)-2-(1-pyrenylcarbonyl)-6-oxa-2-azabicyclo[3.2.1]oct-7-yl]-5-methyl-2,4(1H,3H)-pyrimidinedione

1-[(1R,3R,4S,5R)-4-Hydroxy-3-(hydroxymethyl)-6-(1-pyrenylcarbonyl)-2-oxa-6-azabicyclo[3.2.0]hept-1-yl]-5-methyl-2,4(1H,3H)-pyrimidinedione

1-[(5aR,7R,8R,8aS)-8-(Acetyloxy)-5a,7,8,8a-tetrahydro-5H,10H-furo[2,3-f]tetrazolo[5,1-c][1,4]oxazepin-7-yl]-5-methyl-2,4(1H,3H)-pyrimidinedione

1-[2-Deoxy-5-O-(1-oxoheptadecyl)-β-L-erythro-pentofuranosyl]-5-methyl-2,4(1H,3H)-pyrimidinedione

1-[(1R,5R,7R,8S)-5-[[Bis(4-methoxyphenyl)phenylmethoxy]methyl]-8-hydroxy-2-(1-pyrenylcarbonyl)-6-oxa-2-azabicyclo[3.2.1]oct-7-yl]-5-methyl-2,4(1H,3H)-pyrimidinedione

5-Methyl-1-[(1R,5R,7R,8S)-8-(phenylmethoxy)-5-[(phenylmethoxy)methyl]-2-(1-pyrenylcarbonyl)-6-oxa-2-azabicyclo[3.2.1]oct-7-yl]-2,4(1H,3H)-pyrimidinedione

(1R,3R,4S,5R)-3-[[Bis(4-methoxyphenyl)phenylmethoxy]methyl]-1-(3,4-dihydro-5-methyl-2,4-dioxo-1(2H)-pyrimidinyl)-6-(1-pyrenylcarbonyl)-2-oxa-6-azabicyclo[3.2.0]hept-4-yl 2-cyanoethyl N,N-bis(1-methylethyl)phosphoramidite

1-[(1R,3R,4S,5R)-3-[[Bis(4-methoxyphenyl)phenylmethoxy]methyl]-4-hydroxy-6-(1-pyrenylcarbonyl)-2-oxa-6-azabicyclo[3.2.0]hept-1-yl]-5-methyl-2,4(1H,3H)-pyrimidinedione

(1R,5R,7R,8S)-5-[[Bis(4-methoxyphenyl)phenylmethoxy]methyl]-7-(3,4-dihydro-5-methyl-2,4-dioxo-1(2H)-pyrimidinyl)-2-(1-pyrenylcarbonyl)-6-oxa-2-azabicyclo[3.2.1]oct-8-yl 2-cyanoethyl N,N-bis(1-methylethyl)phosphoramidite

Benzimidazole, 5,6-dichloro-2-ethyl-1-β-D-ribofuranosyl-

3-(Phenylmethyl)-1-(2,3,5-tri-O-acetyl-β-L-ribofuranosyl)-2,4(1H,3H)-pyrimidinedione

1-[2-Deoxy-2-methyl-5-O-(1-oxotetradecyl)-β-D-arabinofuranosyl]-2,4(1H,3H)-pyrimidinedione

1-(4-C-Azido-3-O-benzoyl-2,5-dideoxy-5-iodo-2-methyl-β-D-arabinofuranosyl)-2,4(1H,3H)-pyrimidinedione

3-(Phenylmethyl)-1-(2,3,5-tri-O-benzoyl-β-L-ribofuranosyl)-2,4(1H,3H)-pyrimidinedione

5-Methyl-1-[(1R,5R,7R,8S)-8-(phenylmethoxy)-5-[(phenylmethoxy)methyl]-2,6-dioxa-3-azabicyclo[3.2.1]oct-7-yl]-2,4(1H,3H)-pyrimidinedione

N-Cyclopentyl-2',3'-bis-O-[(1,1-dimethylethyl)dimethylsilyl]-5'-S-ethyl-5'-thioadenosine