The active ingredients mediating the pharmacological effect are mainly sesquiterpene lactones , such as helenalin , 11alpha , 13-dihydrohelenalin , chamissonolid and their ester derivatives .
the active ingredients mediating the pharmacological effect are mainly sesquiterpene lactones , such as helenalin , 11alpha , 13-dihydrohelenalin , chamissonolid and their ester derivatives .
O O O O O B-other_name I-other_name O O B-other_organic_compound I-other_organic_compound O O O B-other_organic_compound O B-other_organic_compound I-other_organic_compound I-other_organic_compound O B-other_organic_compound O O B-other_organic_compound I-other_organic_compound O