1. Department of Pharmacognosy and Natural Products Chemistry, Faculty of Pharmacy; University of Athens, Panepistimioupolis Zografou; Athens 15771 Greece
2. UMR/CNRS 8638, Faculté de Pharmacie; Laboratoire de Pharmacognosie de l'Université Paris Descartes; 4 Avenue de l'Observatoire F-75006 Paris France