Cytidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-3′-O-[(2S,4S,5S)-4-[(methyldiphenylsilyl)methyl]-3-oxa-1-aza-2-phosphabicyclo[3.2.0]hept-2-yl]-N-(2-methyl-1-oxopropyl)-

Guanosine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-3′-O-[(1S,3R,3aS)-3-cyclopentyltetrahydro-3-methyl-1H,3H-pyrrolo[1,2-c][1,3,2]oxazaphosphol-1-yl]-2′-deoxy-2′-fluoro-N-(2-methyl-1-oxopropyl)-

Uridine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-3′-O-[(1S,3R,3aS)-3-cyclopentyltetrahydro-3-methyl-1H,3H-pyrrolo[1,2-c][1,3,2]oxazaphosphol-1-yl]-2′-deoxy-2′-fluoro-

Cytidine, N-acetyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-3′-O-[(1S,3R,3aS)-3-cyclopentyltetrahydro-3-methyl-1H,3H-pyrrolo[1,2-c][1,3,2]oxazaphosphol-1-yl]-2′-deoxy-2′-fluoro-

N-Benzoyl-5'-O-[bis(4-methoxyphenyl)phenylmethyl]-3'-O-[(1S,3R,3aS)-3-cyclopentyltetrahydro-3-methyl-1H,3H-pyrrolo[1,2-c][1,3,2]oxazaphosphol-1-yl]-2'-deoxy-2'-fluoroadenosine

Cytidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-3′-O-[(1S,3R,3aS)-3-cyclobutyltetrahydro-3-methyl-1H,3H-pyrrolo[1,2-c][1,3,2]oxazaphosphol-1-yl]-2′-deoxy-N-(2-methyl-1-oxopropyl)-

Cytidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-3′-O-[(2R,3aR,7aR)-hexahydro-3,7a-dimethyl-1,3,2-benzoxazaphosphol-2(3H)-yl]-N-(2-methyl-1-oxopropyl)-

Cytidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-3′-O-[(2R,3aS,7R,7aS)-7-cyanohexahydro-3-methyl-1,3,2-benzoxazaphosphol-2(3H)-yl]-2′-deoxy-N-(2-methyl-1-oxopropyl)-

Guanosine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-2′-fluoro-3′-O-[(2S,3aS,7aS)-hexahydro-3,7a-dimethyl-1,3,2-benzoxazaphosphol-2(3H)-yl]-N-(2-methyl-1-oxopropyl)-

Uridine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-2′-fluoro-3′-O-[(2S,3aS,7aS)-hexahydro-3,7a-dimethyl-1,3,2-benzoxazaphosphol-2(3H)-yl]-

Cytidine, N-benzoyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-2′-fluoro-3′-O-[(2S,3aS,7aS)-hexahydro-3,7a-dimethyl-1,3,2-benzoxazaphosphol-2(3H)-yl]-

Adenosine, N-benzoyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-O-methyl-3′-O-[(2S,3aS,7aS)-hexahydro-3,7a-dimethyl-1,3,2-benzoxazaphosphol-2(3H)-yl]-

Adenosine, N-benzoyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-2′-fluoro-3′-O-[(2S,3aS,7aS)-hexahydro-3,7a-dimethyl-1,3,2-benzoxazaphosphol-2(3H)-yl]-

Guanosine, 5-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-2′-O-fluoro-N-(2-methyl-1-oxopropyl)-3′-O-[(1′S,3′aS)-tetrahydrospiro[cyclopentane-1,3′-[1H,3H]pyrrolo[1,2-c][1,3,2]oxazaphosphol]-1′-yl]-

Uridine, 5-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-2′-O-fluoro-3′-O-[(1′S,3′aS)-tetrahydrospiro[cyclopentane-1,3′-[1H,3H]pyrrolo[1,2-c][1,3,2]oxazaphosphol]-1′-yl]-