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narbo_001.seq 

 APPROX PRODUCT CHEMISTRY :    
                                                                                
--Loading-(CHO-CHR)-(CH =CR )-
  R=CH3  |  R=CH3  |  R = H  |
narbo_002.seq 

 APPROX PRODUCT CHEMISTRY :    
                                                                                
(CHO-CHR)-(CH2-CHR)-
  R=CH3  |  R=CH3  |
narbo_003.seq 

 APPROX PRODUCT CHEMISTRY :    
                                                                                
(CHO-CHR)-
  R=CH3  |
narbo_004.seq 

 APPROX PRODUCT CHEMISTRY :    
                                                                                
(CO -CHR)-
  R=CH3  |