N-[9-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-3-O-[[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-2-O-methyl-β-D-arabinofuranosyl]-6,9-dihydro-6-oxo-1H-purin-2-yl]-2-methylpropanamide

9-[2-O-Acetyl-3-C-(azidomethyl)-3-O-(phenylmethyl)-β-D-ribofuranosyl]-6-chloro-9H-purine

2-Amino-3'-azido-2',3'-dideoxyadenosine 5'-(trihydrogen diphosphate)

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

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

5',5'''-Dithiobis[2',5'-dideoxyadenosine]

3',5'-O-[Bis(1,1-dimethylethyl)silylene]-2'-deoxy-2'-iodo-5-methyl-1'-C-methyluridine

N-Benzoyl-3',5'-O-[bis(1,1-dimethylethyl)silylene]-2'-deoxy-2'-iodoadenosine

3',5'-O-[Bis(1,1-dimethylethyl)silylene]-2'-deoxy-2'-iodouridine

3',5'-O-[Bis(1,1-dimethylethyl)silylene]-2'-deoxy-2'-iodo-5-methyluridine

2'-Deoxy-3',5'-bis-O-[(1,1-dimethylethyl)dimethylsilyl]-2'-iodo-5-methyluridine

5'-O-[Bis(4-methoxyphenyl)phenylmethyl]-2-O-ethyl-2'-O-methyluridine

5'-O-[Dimethyl(1,1,2-trimethylpropyl)silyl]-2',3',4-tri-O-methyluridine

5'-O-[Dimethyl(1,1,2-trimethylpropyl)silyl]-4-O-methyluridine

5'-Deoxy-2',3'-di-S-ethyl-5'-[4-(4-methylphenyl)-1H-1,2,3-triazol-1-yl]-2',3'-dithiouridine

5'-Deoxy-2',3'-di-S-ethyl-5'-[4-(4-methoxyphenyl)-1H-1,2,3-triazol-1-yl]-2',3'-dithiouridine

5'-Deoxy-2',3'-di-S-ethyl-5'-[4-(4-fluorophenyl)-1H-1,2,3-triazol-1-yl]-2',3'-dithiouridine

5'-Deoxy-2',3'-di-S-ethyl-5'-(4-phenyl-1H-1,2,3-triazol-1-yl)-2',3'-dithiouridine

3'-Deoxy-3'-fluoroadenosine 5'-(tetrahydrogen triphosphate)

3'-Deoxy-3'-fluoroguanosine 5'-(tetrahydrogen triphosphate)