title: Sesquiterpene lactones of Centaurea scoparia.
abstract: From the ethanolic extract of the aerial parts of Centaurea scoparia four new sesquiterpene lactones, belonging to the guaiane class, were isolated and identified, together with a known germacranolide. The structures were elucidated by spectroscopic methods including one- and two-dimensional NMR studies. The relative configuration was deduced from the 2D NOESY spectra. CD spectroscopy of the chlorinated compounds was used for determination of their absolute configuration.
authors.affiliation: Department of Pharmacognosy, Faculty of Pharmacy, Suez Canal University, 41522, Ismailia, Egypt
authors.forename: Diaa T. A.
authors.initials: DT
authors.lastname: Youssef