Sesquiterpene lactones from Centaurea tweediei

Aerial parts of Centaurea tweediei from Argentina afforded as the main constituent the sesquiterpene lactone onopordopicrin and minor amounts of a new heliangolide, a new guaianolide, a new eudesmanolide, a new eudesmane acid and the lignans arctigenin and matairesinol. (C) 2001 Elsevier Science Ltd. All rights reserved.