isethionic acid
noun
                                                                                                                            
                                                            is·ethi·on·ic acid
                    
                                                                                                              
                                                                                                                                  ˌīs-ˌē-thē-ˌän-ik-  
                                                      
                                                          
            
                                
              
          
                                                      : a crystalline sulfonic acid C2H6O4S used especially in making surface-active agents                                      
                
                    
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  Merriam-Webster unabridged




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