Beibersteneolide-a and -b:Two new sesquiterpene lactones from Achillea beiberstenii

摘要

The aerial part of Achillea beiberstenii (Compositae) has afforded two new sesquiterpene lactones,characterized as 3alpha,9beta-diacetoxy-1beta,10-epoxy-5(4)-en-germacran-6beta,12-olide,named as beiberstcneolide-a 1,and 4,9beta-dihydroxy-2(1),6(5),1 l(13)-triene-guaian-7alpha,12-olide,designated as beibersteneolide-b 2.The structures of the isolated compounds have been elucidated on the basis of spectral studies.