SHIOKAWA et al. V. MAIENFISCH et al. - Page 34

                                            CH                      CH                                 
                                               2                       2                               
                                            O                       O                                  
                                            S                       S                                  
             R2             hydrogen atom                           hydrogen atom                      
                            C  alkyl group  C  alkyl group          C  alkyl group                     
                             1-4              1-3                    1-4                               




































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