9-(5-O-acetyl-3-O-benzyl-2-deoxy-2-fluoro-4-thio-α(and β)-D-arabino-pentofuranosyl)-2,6-diaminopurine

9-(5-O-acetyl-3-O-benzyl-2-deoxy-2-fluoro-4-thio-α(and β)-D-arabino-pentofuranosyl)-2-fluoroadenine

5-(2-tert-butyldimethylsilyloxyethyl)-1-(5-O-(tert-butyldiphenylsilyl)-2-deoxy-2-fluoro-4-thio-α-D-arabinopentofuranosyl)uracil

5-(2-tert-butyldimethylsilyloxyethyl)-1-(5-O-(tert-butyldiphenylsilyl)-2-deoxy-2-fluoro-4-thio-β-D-arabinopentofuranosyl)uracil