1. University of Liège, Natural and Synthetic Drugs Research Center, Laboratory of Pharmacognosy, Avenue de l'Hôpital 1, B36, B-4000 Liège, Belgium, University of Liège, Laboratory of Medical Microbiology, Liège, Belgium, Laboratoire de Pharmacognosie, UMR 6013 CNRS, Bâtiment 18, Moulin de la Housse, 51687 Reims Cedex 2, France