1. Divisions of Pharmaceutical Chemistry and Pharmacognosy, Department of Pharmacy, University of Athens, Panepistimiopolis-Zografou, Athens 15771, Greece, Laboratory of Cell Proliferation & Aging, Institute of Biology, NCSR “Democritos”, Athens 15310, Greece, and Institut de Recherches Servier, 11 Rue des Moulineaux, 92150 Suresnes, France