Ex parte WELCH - Page 12

          Appeal No. 1997-1816                                                        
          Application No. 08/178,269                                                  























          whe                                                       rein R7           
          and                                                       R  are            
                                                                     8                
          eac                                                       h                 
          sel                                                       ected             
          fro                                                       m the             
          group consisting of hydrogen and methyl.                                    






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