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£¨1£©Bisacchi GS,Sundeen JE. improved process for preparing the  antiviral agent
[1s-(1a,3a,4b)]-2-amino-1,9-dihydro-9-[4-hydroxy-3-(hydroxymethyl)-methylenecyclopentl]-6-purine-one. WO 98/09964.1998-03-12
£¨2£©pennington RZ, Slusarchyk WA,Skillman, et al. Hydroxymethyl(methylenecyclopentyl) purines and pyrimidines [p].US 5206244.1993-04-27
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