Fitoterapia. 2002 Feb; 73(1): 97-8.

A new eudesmane derivative from Onopordon ambiguum.

El-Moghazy SA, Ahmed AA, Abdel-Ghani HF, El-Shanawany MA.

Department of Pharmacognosy, Faculty of Pharmacy, Assiut University, Assiut, Egypt.

Reinvestigation of Onopordon ambiguum extract afforded a new eudesmane derivative 1, in addition to the known elemanoid derivative 2. The structures of both compounds were determined by spectroscopic techniques, including 1H-, 13C-NMR, DEPT, 1H-1H and 1H-13C COSY analysis.