9-(5-pivaloyl-3-fluoro-2,3-dideoxy-β-D-ribofuranosyl)-2-acetamido-6-chloropurine

N2,5'-O-ditrityl-8,2'-anhydro-3'-deoxy-3'-fluoro-8-mercapto-9-β-arabinofuranosylguanine

N2,5'-O-ditrityl-8,2'-anhydro-8-mercapto-9-β-arabinofuranosylguanine

8,2'-anhydro-8-mercaptoguanosine

鸟苷