Sesquiterpene lactones from Centaurea tougourensis
Résumé
Fractionation of the dichloromethane extract of Centaurea tougourensis (Boiss. and Reut.) led to the isolation of four sesquiterpene lactones: an elemanolide (1), a germacranolide (2) and two heliangolides (3, 4), the latter being identified for the first time from natural source