1,3-Bis(1,1-dimethylethyl) 2-[2-chloro-9-[2-deoxy-5-O-[(1R)-1-(diethoxyphosphinyl)-2-ethoxy-2-oxoethyl]-3-O-[(1,1-dimethylethoxy)carbonyl]-2-fluoro-β-D-arabinofuranosyl]-9H-purin-6-yl]imidodicarbonate

4-Amino-1-[2-deoxy-3-O-[dimethyl(1-methylethyl)silyl]-β-D-erythro-pentofuranosyl]-1,3,5-triazin-2(1H)-one

4-Amino-1-[2-deoxy-3-O-(dimethylpropylsilyl)-β-D-erythro-pentofuranosyl]-1,3,5-triazin-2(1H)-one

4-Amino-1-[2-deoxy-3-O-(triethylsilyl)-β-D-erythro-pentofuranosyl]-1,3,5-triazin-2(1H)-one

4-Amino-1-[5-O-(cyclopentyldiethylsilyl)-2-deoxy-β-D-erythro-pentofuranosyl]-1,3,5-triazin-2(1H)-one

4-Amino-1-[5-O-(cyclohexyldimethylsilyl)-2-deoxy-β-D-erythro-pentofuranosyl]-1,3,5-triazin-2(1H)-one

4-Amino-1-[5-O-(cyclopentyldimethylsilyl)-2-deoxy-β-D-erythro-pentofuranosyl]-1,3,5-triazin-2(1H)-one

Uridine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-5-[(1E)-3-[[2-[4-(2,2-dimethyl-1-oxopropoxy)phenyl]ethyl]amino]-3-oxo-1-propen-1-yl]-, 3′-[2-cyanoethyl N,N-bis(1-methylethyl)phosphoramidite]

5′-O-[Bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-5-[(1E)-3-[[2-[4-(2,2-dimethyl-1-oxopropoxy)phenyl]ethyl]amino]-3-oxo-1-propen-1-yl]uridine

Uridine, 5-[(1E)-3-[[2-(acetyloxy)ethyl]amino]-3-oxo-1-propen-1-yl]-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-, 3′-[2-cyanoethyl N,N-bis(1-methylethyl)phosphoramidite]