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

4-(acetylsulfanyl)-5-(tert-butyldiphenylsilyloxy)-2-fluoropentanoic acid methyl ester

N4-benzoyl-1-[(1R,2R,4S)-5-O-(tert-butyldiphenylsilyl)-2,3-dideoxy-2-fluoro-2-phenylselanyl-4-thio-β-D-pentofuranosyl]-5-fluorocytosine

(2S,4S)-(+)-4-tert-butyldiphenylsilyloxymethyl-2-fluoro-γ-butyrolactone

5-(tert-butyldiphenylsilyloxy)-2-fluoro-4-iodopentanoic acid methyl ester

(2S,4S)-5-(tert-Butyl-diphenyl-silanyloxy)-2-fluoro-4-hydroxy-pentanoic acid methyl ester

(3R,5S)-5-(tert-Butyl-diphenyl-silanyloxymethyl)-3-fluoro-3-phenylselanyl-dihydro-thiophen-2-one

Acetic acid (3R,5S)-5-(tert-butyl-diphenyl-silanyloxymethyl)-3-fluoro-3-phenylselanyl-tetrahydro-thiophen-2-yl ester