4-Amino-1-[(2S,3S,5R)-5-(tert-butyl-diphenyl-silanyloxymethyl)-3-phenylselanyl-tetrahydro-furan-2-yl]-5-fluoro-1H-pyrimidin-2-one

9-[5-O-(tert-butyldiphenylsilyl)-3-deoxy-2-Se-phenyl-2-seleno-β-L-erythro-pentofuranosyl]guanine

9-[5-O-(tert-butyldiphenylsilyl)-2,3-deoxy-β-L-glycero-pent-2-enofuranosyl]-2-fluoroadenine

2-Amino-9-[(2S,5R)-5-(tert-butyl-diphenyl-silanyloxymethyl)-tetrahydro-furan-2-yl]-9H-purin-6-ol

Acetic acid (R)-5-(tert-butyl-diphenyl-silanyloxymethyl)-3-fluoro-2,5-dihydro-furan-2-yl ester