N-[9-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-2-deoxy-3-O-[(1,1-dimethylethyl)dimethylsilyl]-2-fluoro-4-C-(iodomethyl)-β-D-arabinofuranosyl]-6-(dimethylamino)-9H-purin-2-yl]-2-methylpropanamide

N-[9-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-2-deoxy-3-O-[(1,1-dimethylethyl)dimethylsilyl]-2-fluoro-4-C-(hydroxymethyl)-β-D-arabinofuranosyl]-6-(dimethylamino)-9H-purin-2-yl]-2-methylpropanamide

N-[9-[2-Deoxy-3-O-[(1,1-dimethylethyl)dimethylsilyl]-2-fluoro-4-C-(hydroxymethyl)-β-D-threo-pentofuranosyl]-6-(dimethylamino)-9H-purin-2-yl]-2-methylpropanamide

N-[9-[2-Deoxy-3,5-bis-O-[(1,1-dimethylethyl)dimethylsilyl]-2-fluoro-β-D-arabinofuranosyl]-6-(dimethylamino)-9H-purin-2-yl]-2-methylpropanamide

N-[9-[2-Deoxy-3-O-[(1,1-dimethylethyl)dimethylsilyl]-2-fluoro-β-D-arabinofuranosyl]-6-(dimethylamino)-9H-purin-2-yl]-2-methylpropanamide

9-[2-Deoxy-3,5-bis-O-[(1,1-dimethylethyl)dimethylsilyl]-2-fluoro-β-D-arabinofuranosyl]-N6,N6-dimethyl-9H-purine-2,6-diamine