Cytidine, 5'-O-[bis(4-methoxyphenyl)phenylmethyl]-2'-deoxy-N-(1-methyl-2-pyrrolidinylidene)-, 3'-[methyl bis(1-methylethyl)phosphoramidite], (S)-

Guanosine, 5'-O-[bis(4-methoxyphenyl)phenylmethyl]-2'-deoxy-N-[1-(dimethylamino)ethylidene]-, 3'-[methyl bis(1-methylethyl)phosphoramidite]

Cytidine, 5'-O-[bis(4-methoxyphenyl)phenylmethyl]-2'-deoxy-5-methyl-N-(1-methyl-2-pyrrolidinylidene)-

2'-Amino-5'-O-[bis(4-methoxyphenyl)phenylmethyl]-2'-deoxy-3'-O-[(1,1-dimethylethyl)diphenylsilyl]uridine

N,N'-[[4-[1-[3-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-2-deoxy-β-D-erythro-pentofuranosyl]-3,6-dihydro-2,6-dioxo-1(2H)-pyrimidinyl]-1H-1,2,3-triazol-4-yl]-2,6-pyridinediyl]bis(methylene)]bis[N-(2-methoxy-2-oxoethyl)glycine] 1,1'-dimethyl ester

3-(3-Azidopropyl)-5'-O-[bis(4-methoxyphenyl)phenylmethyl]-2'-deoxyuridine

1-[(2R,3aR,4S,7aS)-Hexahydro-4-(1-methylethyl)-2H-furo[2,3-c]pyran-2-yl]-5-methyl-2,4(1H,3H)-pyrimidinedione

Guanosine, 8-(acetylphenylamino)-5'-O-[bis(4-methoxyphenyl)phenylmethyl]-2'-deoxy-N-[(dimethylamino)methylene]-, 3'-[2-cyanoethyl N,N-bis(1-methylethyl)phosphoramidite]

8-(Acetylphenylamino)-5'-O-[bis(4-methoxyphenyl)phenylmethyl]-2'-deoxy-N-[(dimethylamino)methylene]guanosine

5-[(1-Methylpropoxy)methyl]-1-[(2S,5S)-tetrahydro-5-(hydroxymethyl)-2-furanyl]-2,4(1H,3H)-pyrimidinedione

1-[(2R,3aR,4R,7aS)-4-Ethylhexahydro-5-oxo-2H-furo[2,3-c]pyran-2-yl]-5-methyl-2,4(1H,3H)-pyrimidinedione

1-[(2R,3aR,4R,7aS)-4-Butylhexahydro-5-oxo-2H-furo[2,3-c]pyran-2-yl]-5-methyl-2,4(1H,3H)-pyrimidinedione

1-[(2R,3aR,4S,7aS)-Hexahydro-4-propyl-2H-furo[2,3-c]pyran-2-yl]-5-methyl-2,4(1H,3H)-pyrimidinedione

1-[(2R,3aR,4S,7aS)-Hexahydro-4-methyl-2H-furo[2,3-c]pyran-2-yl]-5-methyl-2,4(1H,3H)-pyrimidinedione

1-[(3aS,4R,6R,6aR)-Hexahydro-6-(hydroxymethyl)-3-methylfuro[3,4-b]furan-4-yl]-2,4(1H,3H)-pyrimidinedione

1-[(3aS,4R,6R,6aR)-Hexahydro-6-(hydroxymethyl)-3-(1-methylethyl)furo[3,4-b]furan-4-yl]-2,4(1H,3H)-pyrimidinedione

1-[(3aS,4R,6R,6aR)-Hexahydro-6-(hydroxymethyl)-3-propylfuro[3,4-b]furan-4-yl]-2,4(1H,3H)-pyrimidinedione

1-[(3aS,4S,6R,6aS)-Hexahydro-4-(hydroxymethyl)-3-methylfuro[3,4-b]furan-6-yl]-2,4(1H,3H)-pyrimidinedione

1-[(3aS,4S,6R,6aS)-Hexahydro-4-(hydroxymethyl)-3-(1-methylethyl)furo[3,4-b]furan-6-yl]-2,4(1H,3H)-pyrimidinedione

1-[(3aS,4S,6R,6aR)-Hexahydro-4-[[(4-methoxyphenyl)diphenylmethoxy]methyl]-3-methylenefuro[3,4-b]furan-6-yl]-2,4(1H,3H)-pyrimidinedione