Sesquiterpene lactones and other constituents from Cassinia, actinobole and an axeton species

The investigation of five representatives of Australian Gnaphaliinae species afforded in addition to several known compounds 17 new sesquiterpene lactones, 13 eudesmane derivatives derived from costic acid, ten further various sesquiterpenes and an unusual ester. The structures were elucidated by high field NMR techniques. The chemotaxonomic situation is discussed briefly.