This study used methanol and ethyl acetate to extract sesquiterpenes from E. adenophorum. Sesquiterpenes accounted for 98.57% of the oil extracts isolated using this method. A previous study that used a hydrodistillation method to extract sesquiterpenes in inflorescence oil and root oil of E. adenophorum reported a different composition of inflorescence and root oils . The use of different extraction methods might account for differences in the composition of the oils in the sesquiterpenes.