(2'R)-2'-Cyano-2'-deoxy-2'-methylguanosine

5'-[[2-(Cyclohexylamino)-2-oxoethyl](2,3-dihydroxybenzoyl)amino]-5'-deoxyuridine

5'-[[N-[2-[[2-(Acetylamino)-2-deoxy-α-D-glucopyranosyl]oxy]acetyl]-L-α-aspartyl-L-α-aspartyl]amino]-5'-deoxyuridine

5,6-Dichloro-2-iodo-1-(2,3,5-tri-O-acetyl-β-D-ribofuranosyl)-1H-benzimidazole

(2'R)-2'-Chloro-2'-deoxy-2'-methylguanosine

(2'R)-2'-Chloro-2'-deoxy-6-O-ethyl-2'-methylguanosine

Sofosbuvir Impurity 68

(2'R)-2',3'-Dideoxy-6-O-ethyl-2'-fluoro-2'-methylguanosine

(2'R)-2'-Cyano-2'-deoxy-N-[(4-methoxyphenyl)diphenylmethyl]-2'-methylcytidine

5'-O-[(1,1-Dimethylethyl)dimethylsilyl]-5-iodouridine

3'-Deoxy-5'-O-[(1,1-dimethylethyl)diphenylsilyl]-3'-formyl-5-methyl-2'-O-methyluridine

5'-[4-(6-Bromo-2-pyridinyl)-1H-1,2,3-triazol-1-yl]-5'-deoxyuridine

N-[(4-Methoxyphenyl)diphenylmethyl]-2'-C-methylcytidine

5'-[[(6-Bromo-2-pyridinyl)carbonyl]amino]-5'-deoxyuridine

1-[2-O-Acetyl-5-O-benzoyl-3-C-cyano-3-O-(methylsulfonyl)-β-D-ribofuranosyl]-1H-benzimidazole

3'-[4-(3-Chloropropyl)-1H-1,2,3-triazol-1-yl]-3'-deoxy-5-methyluridine

3'-Deoxy-3'-[4-(hydroxymethyl)-1H-1,2,3-triazol-1-yl]-5-methyluridine

2',3'-Dideoxy-5'-O-[(1,1-dimethylethyl)diphenylsilyl]-2'-(2-ethoxy-1-hydroxy-1-methyl-2-oxoethyl)-5-methyluridine

1-(2,3-Di-O-acetyl-5-deoxy-β-D-ribofuranosyl)-6-(trifluoromethyl)-1H-benzimidazole

1-(2,3-Di-O-acetyl-5-deoxy-β-D-ribofuranosyl)-5-(trifluoromethyl)-1H-benzimidazole