Ex parte SINGH et al. - Page 8




          Appeal No. 95-0865                                                           
          Application 08/08/007,950                                                    

          The method involves the reaction of Bisacchi cyclobutane                     
          Compound 13 (col. 3)                                                         











          with 2-amino-6-chloropurine (col. 7, last line through col. 8,               
          first line) to produce Bisacchi Compound 14 (col. 3)                         













          where W can be 2-amino-6-chloropurine-9-yl (col. 7, lines 32-33):            






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