isolysergic acid
noun
                                                                                                                            
                                                            iso·ly·ser·gic acid
                    
                                                                                                              
                                                                                                                                  ˌī-sō-lə-ˌsər-jik-, -(ˌ)lī-  
                                                      
                                                          
            
                                
              
          
                                                      : an acid C16H16N2O2 that is isomeric with lysergic acid and is the parent compound of several ergotic alkaloids                                      
                
                    
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  Merriam-Webster unabridged




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