1-[5-O-(tert-butyldiphenylsilyl)-2,3-dideoxy-2,3-didehydro-2-fluoro-4-thio-β-D-ribofuranosyl]thymine

(+)-9-[(1R,2R,4S)-5-O-(tert-butyldiphenylsilyl)-2,3-dideoxy-2-fluoro-2-phenylselenyl-4-thio-β-D-ribofuranosyl]-6-chloro-2-fluoropurine

9-[(2R,3S,5S)-5-(tert-Butyl-diphenyl-silanyloxymethyl)-3-fluoro-tetrahydro-furan-2-yl]-6-chloro-9H-purine

N4-benzoyl-1-[5-O-(tert-butyldiphenylsilyl)-2,3-dideoxy-2,3-didehydro-2-fluoro-4-thio-β-D-ribofuranosyl]-5-fluorocytosine