2'-Deoxy-3'-O-(1,3-dihydro-1,3-dioxo-2H-isoindol-2-yl)-5'-O-[(1,1-dimethylethyl)dimethylsilyl]-N-[(dimethylamino)methylene]-5-iodocytidine

3'-O-Amino-5-[3-[[(2-amino-1,1-dimethylethyl)dithio]methoxy]-1-propyn-1-yl]-2'-deoxyuridine 5'-(tetrahydrogen triphosphate)

2'-Deoxy-5'-O-[(1,1-dimethylethyl)dimethylsilyl]-3'-O-[(1-methylethylidene)amino]-5-iodouridine

3'-O-Amino-2'-deoxy-5'-O-[(1,1-dimethylethyl)dimethylsilyl]-5-iodouridine

2'-Deoxy-3'-O-(1,3-dihydro-1,3-dioxo-2H-isoindol-2-yl)-5'-O-[(1,1-dimethylethyl)dimethylsilyl]-5-iodouridine

3'-O-Amino-2'-deoxy-5'-O-[(1,1-dimethylethyl)dimethylsilyl]-N-[(dimethylamino)methylene]-5-iodocytidine

2'-Deoxy-N-(3,5-di-O-acetyl-2-deoxy-α-D-erythro-pentofuranosyl)-5'-O-[(1,1-dimethylethyl)diphenylsilyl]-5-methylcytidine

2'-Deoxy-5'-O-[(1,1-dimethylethyl)diphenylsilyl]-5-methylcytidine

N-Benzoyl-2'-deoxy-5'-O-[(1,1-dimethylethyl)diphenylsilyl]-5-methylcytidine

2'-Deoxy-N-(3,5-di-O-acetyl-2-deoxy-β-D-erythro-pentofuranosyl)-5'-O-[(1,1-dimethylethyl)diphenylsilyl]-5-methylcytidine

1-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-3-O-[[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-2-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-ribofuranosyl]-1H-benzimidazole

N-Benzoyl-2'-deoxy-3'-O-(3,5-di-O-acetyl-2-deoxy-α-D-erythro-pentofuranosyl)-5'-O-[(1,1-dimethylethyl)diphenylsilyl]-5-methylcytidine

3'-Amino-5'-azido-3',5'-dideoxythymidine

1-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-2-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-ribofuranosyl]-1H-benzimidazole

1-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-β-D-ribofuranosyl]-1H-benzimidazole

N-Benzoyl-5'-O-[bis(4-methoxyphenyl)phenylmethyl]-3'-O-[5-O-[bis(4-methoxyphenyl)phenylmethyl]-3-O-[[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-2-deoxy-β-D-erythro-pentofuranosyl]-2'-deoxy-5-methylcytidine

2'-Deoxy-3'-O-(2-deoxy-α-D-erythro-pentofuranosyl)-5-methylcytidine

2'-Deoxy-3'-O-(2-deoxy-β-D-erythro-pentofuranosyl)-5'-O-[(1,1-dimethylethyl)diphenylsilyl]-5-methylcytidine

2'-Deoxy-3'-O-(2-deoxy-α-D-erythro-pentofuranosyl)-5'-O-[(1,1-dimethylethyl)diphenylsilyl]-5-methylcytidine

N-Benzoyl-2'-deoxy-3'-O-(3,5-di-O-acetyl-2-deoxy-β-D-erythro-pentofuranosyl)-5'-O-[(1,1-dimethylethyl)diphenylsilyl]-5-methylcytidine