3′-Amino-P(O)-(2-cyanoethyl)-2′,3′-dideoxy-5′-O-[(1,1-dimethylethyl)dimethylsilyl]-N-(2-methyl-1-oxopropyl)-P-thioguanylyl-(3′→5′)-2′,3′-dideoxy-N-(2-methyl-1-oxopropyl)-3′-[(triphenylmethyl)amino]guanosine

3′-Amino-P(O)-(2-cyanoethyl)-2′,3′-dideoxy-5′-O-[(1,1-dimethylethyl)dimethylsilyl]-N-(2-methyl-1-oxopropyl)-P-thioguanylyl-(3′→5′)-N-benzoyl-2′,3′-dideoxy-3′-[(triphenylmethyl)amino]adenosine

3′-Amino-N-benzoyl-P(O)-(2-cyanoethyl)-2′,3′-dideoxy-5′-O-[(1,1-dimethylethyl)dimethylsilyl]-P-thioadenylyl-(3′→5′)-N-benzoyl-2′,3′-dideoxy-3′-[(triphenylmethyl)amino]adenosine

3′-Amino-P(O)-(2-cyanoethyl)-P-deoxo-2′,3′-dideoxy-5′-O-[(1,1-dimethylethyl)dimethylsilyl]-N-(2-methyl-1-oxopropyl)guanylyl-(3′→5′)-2′,3′-dideoxy-N-(2-methyl-1-oxopropyl)-3′-[(triphenylmethyl)amino]guanosine

3′-Amino-P(O)-(2-cyanoethyl)-P-deoxo-2′,3′-dideoxy-5′-O-[(1,1-dimethylethyl)dimethylsilyl]-N-(2-methyl-1-oxopropyl)guanylyl-(3′→5′)-N-benzoyl-2′,3′-dideoxy-3′-[(triphenylmethyl)amino]adenosine

3′-Amino-N-benzoyl-P(O)-(2-cyanoethyl)-P-deoxo-2′,3′-dideoxy-5′-O-[(1,1-dimethylethyl)dimethylsilyl]adenylyl-(3′→5′)-N-benzoyl-2′,3′-dideoxy-3′-[(triphenylmethyl)amino]adenosine

Adenosine, 3′-[[bis(4-methoxyphenyl)phenylmethyl]amino]-2′,3′-dideoxy-N-[(dimethylamino)methylene]-, 5′-[2-cyanoethyl N,N-bis(1-methylethyl)phosphoramidite]

Adenosine, 2′,3′-dideoxy-N-[(dimethylamino)methylene]-3′-[(2,7-dimethyl-9-phenyl-9H-xanthen-9-yl)amino]-, 5′-[2-cyanoethyl N,N-bis(1-methylethyl)phosphoramidite]

Adenosine, 2′,3′-dideoxy-N-[(dimethylamino)methylene]-3′-[[(4-methoxyphenyl)diphenylmethyl]amino]-, 5′-[2-cyanoethyl N,N-bis(1-methylethyl)phosphoramidite]

Uridine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-3-[(1,1-dimethylethoxy)carbonyl]-2′-O-[(1,1-dimethylethyl)dimethylsilyl]-, 3′-[2-cyanoethyl N,N-bis(1-methylethyl)phosphoramidite]

2'-Deoxy-N-[(1,1-dimethylethoxy)carbonyl]-2',2'-difluoroadenosine

1,1-Dimethylethyl N-[2-chloro-9-(2-deoxy-2-fluoro-β-D-arabinofuranosyl)-9H-purin-6-yl]carbamate

2-Chloro-2′-deoxy-N-[(1,1-dimethylethoxy)carbonyl]adenosine

1,1-Dimethylethyl N-(9-β-D-arabinofuranosyl-2-fluoro-9H-purin-6-yl)carbamate

1,1-Dimethylethyl N-(9-β-D-arabinofuranosyl-9H-purin-6-yl)carbamate

1,1-Dimethylethyl N-(1-β-D-arabinofuranosyl-1,2-dihydro-2-oxo-4-pyrimidinyl)carbamate

Cytidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-N-[(1,1-dimethylethoxy)carbonyl]-2′-O-[(1,1-dimethylethyl)dimethylsilyl]-, 3′-[2-cyanoethyl N,N-bis(1-methylethyl)phosphoramidite]

Adenosine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-N,N-bis[(1,1-dimethylethoxy)carbonyl]-2′-O-[(1,1-dimethylethyl)dimethylsilyl]-, 3′-[2-cyanoethyl N,N-bis(1-methylethyl)phosphoramidite]

Thymidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-3-[(1,1-dimethylethoxy)carbonyl]-, 3′-[2-cyanoethyl [P(S)]-N,N-bis(1-methylethyl)phosphoramidite]

Thymidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-3-[(1,1-dimethylethoxy)carbonyl]-, 3′-[2-cyanoethyl [P(R)]-N,N-bis(1-methylethyl)phosphoramidite]