1,3-Bis(1,1-dimethylethyl) 2-[2-chloro-9-[2-deoxy-3-O-[(1,1-dimethylethoxy)carbonyl]-5-O-[2-ethoxy-1-(ethoxycarbonyl)-1-[[4-[[(3-methoxy-3-oxopropyl)amino]carbonyl]phenyl]methyl]-2-oxoethyl]-2-fluoro-β-D-arabinofuranosyl]-9H-purin-6-yl]imidodicarbonate

9-[5-O-[1-([1,1′-Biphenyl]-4-ylmethyl)-2-ethoxy-1-(ethoxycarbonyl)-2-oxoethyl]-2-deoxy-2-fluoro-β-D-arabinofuranosyl]-2-chloro-9H-purin-6-amine

1,3-Bis(1,1-dimethylethyl) 2-[2-chloro-9-[2-deoxy-3-O-[(1,1-dimethylethoxy)carbonyl]-5-O-[1-([1,1′-biphenyl]-4-ylmethyl)-2-ethoxy-1-(ethoxycarbonyl)-2-oxoethyl]-2-fluoro-β-D-arabinofuranosyl]-9H-purin-6-yl]imidodicarbonate

2-Chloro-9-[5-O-(dicarboxymethyl)-β-D-xylofuranosyl]-9H-purin-6-amine

2-Chloro-9-[5-O-[2-ethoxy-1-(ethoxycarbonyl)-2-oxoethyl]-β-D-xylofuranosyl]-9H-purin-6-amine

1,3-Bis(1,1-dimethylethyl) 2-[2-chloro-9-[3-O-[(1,1-dimethylethoxy)carbonyl]-2-O-[(1,1-dimethylethyl)dimethylsilyl]-5-O-[2-ethoxy-1-(ethoxycarbonyl)-2-oxoethyl]-β-D-xylofuranosyl]-9H-purin-6-yl]imidodicarbonate

1,3-Bis(1,1-dimethylethyl) 2-[2-chloro-9-[3-O-[(1,1-dimethylethoxy)carbonyl]-2-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-xylofuranosyl]-9H-purin-6-yl]imidodicarbonate

1,3-Bis(1,1-dimethylethyl) 2-[2-chloro-9-[3-O-[(1,1-dimethylethoxy)carbonyl]-2-O-[(1,1-dimethylethyl)dimethylsilyl]-5-O-[(4-methoxyphenyl)diphenylmethyl]-β-D-xylofuranosyl]-9H-purin-6-yl]imidodicarbonate

2′-Amino-2-chloro-2′-deoxy-N,N-bis[(1,1-dimethylethoxy)carbonyl]-5′-O-[2-ethoxy-1-(ethoxycarbonyl)-2-oxo-1-(phenylmethyl)ethyl]adenosine

2′-Azido-2-chloro-2′-deoxy-N,N-bis[(1,1-dimethylethoxy)carbonyl]-5′-O-[2-ethoxy-1-(ethoxycarbonyl)-2-oxo-1-(phenylmethyl)ethyl]adenosine

2′-Azido-2-chloro-2′-deoxy-N,N-bis[(1,1-dimethylethoxy)carbonyl]-5′-O-[2-ethoxy-1-(ethoxycarbonyl)-2-oxoethyl]adenosine

2′-Azido-2-chloro-2′-deoxy-N,N-bis[(1,1-dimethylethoxy)carbonyl]adenosine

2′-Azido-2-chloro-2′-deoxy-N,N-bis[(1,1-dimethylethoxy)carbonyl]-3′,5′-O-[1,1,3,3-tetrakis(1-methylethyl)-1,3-disiloxanediyl]adenosine

2′-Azido-2-chloro-2′-deoxy-3′,5′-O-[1,1,3,3-tetrakis(1-methylethyl)-1,3-disiloxanediyl]adenosine

2-Chloro-9-[3,5-O-[1,1,3,3-tetrakis(1-methylethyl)-1,3-disiloxanediyl]-2-O-[(trifluoromethyl)sulfonyl]-β-D-arabinofuranosyl]-9H-purin-6-amine

2-Chloro-9-[3,5-O-[1,1,3,3-tetrakis(1-methylethyl)-1,3-disiloxanediyl]-β-D-arabinofuranosyl]-9H-purin-6-amine