3',5'-Bis-O-[(1,1-dimethylethyl)dimethylsilyl]-N-[[(trans-4-hydroxycyclohexyl)amino]carbonyl]-2'-O-methyladenosine

6-S-[(3-Bromophenyl)methyl]-6-thioguanosine

5'-Deoxy-5'-[(2S)-2-[(2S,3S,4R,5R)-5-(3,4-dihydro-2,4-dioxo-1(2H)-pyrimidinyl)tetrahydro-3,4-dihydroxy-2-furanyl]-4-oxo-3-thiazolidinyl]-5-methyluridine

5'-Deoxy-5'-[(2R)-2-[(2S,3S,4R,5R)-5-(3,4-dihydro-5-methyl-2,4-dioxo-1(2H)-pyrimidinyl)tetrahydro-3,4-dihydroxy-2-furanyl]-4-oxo-3-thiazolidinyl]-5-methyluridine

5'-Deoxy-5'-[(2S)-2-[(2S,3S,4R,5R)-5-(3,4-dihydro-5-methyl-2,4-dioxo-1(2H)-pyrimidinyl)tetrahydro-3,4-dihydroxy-2-furanyl]-4-oxo-3-thiazolidinyl]-5-methyluridine

2'-O-Methylguanylyl-(3'→4')-8,9-didehydro-9-de-β-D-ribofuranosyl-7,8-dihydro-9-[[(3R,4R)-3-hydroxy-4-(hydroxymethyl)-1-pyrrolidinyl]methyl]-9-deazaadenylyl-(3'→5')-2'-O-methylguanylyl-(3'→5')-2'-O-methyladenosine

5'-Deoxy-5'-[(2R)-2-[(2S,3S,4R,5R)-5-(3,4-dihydro-2,4-dioxo-1(2H)-pyrimidinyl)tetrahydro-3,4-dihydroxy-2-furanyl]-4-oxo-3-thiazolidinyl]-5-methyluridine

5'-O-[Bis(4-methoxyphenyl)phenylmethyl]-N-[[[trans-4-[(1,4-dioxopentyl)oxy]cyclohexyl]amino]carbonyl]-2'-O-methyladenosine

3'-De(phosphinicooxy)thymidylylimino(6-chloro-1,3,5-triazine-2,4-diyl)imino-(3'→5')-5'-deoxy-5-methyluridine

5',5'''-[(6-Chloro-1,3,5-triazine-2,4-diyl)diimino]bis[5'-deoxyuridine]

5',5'''-[(6-Chloro-1,3,5-triazine-2,4-diyl)diimino]bis[5'-deoxy-5-methyluridine]

5'-Deoxy-5'-[(4,6-dichloro-1,3,5-triazin-2-yl)amino]-5-methyluridine

2'-Deoxyguanylyl-(3'→5')-2'-deoxyguanylyl-(3'→5')-thymidylyl-(3'→5')-2'-deoxyuridylyl-(3'→5')-2'-deoxyuridine

3'-De(phosphinicooxy)thymidylylimino(6-chloro-1,3,5-triazine-2,4-diyl)imino-(3'→5')-5'-deoxyuridine

Sofosbuvir impurity F

2-Amino-N-cyclopentyl-2'-C-methyladenosine

(2'R)-N-[Bis(4-methoxyphenyl)phenylmethyl]-5'-O-[bis(4-methoxyphenyl)phenylmethyl]-2'-deoxy-2'-fluoro-2'-methyl-6-O-methylguanosine

(2'R)-5'-O-[Bis(4-methoxyphenyl)phenylmethyl]-2'-deoxy-2'-fluoro-2'-methyl-6-O-methylguanosine

5'-[[2-[Bis(phosphonomethyl)amino]acetyl]amino]-5'-deoxyuridine

5'-[(2-Bromo-1-oxohexadecyl)amino]-5'-deoxyuridine