1. Laboratory of Pharmacognosy and Natural Products Chemistry, School of Pharmacy, University of Athens, Panepistimioupoli Zografou, 15771 Athens, Greece
2. Laboratoire de Pharmacognosie de l’Université Paris Descartes, UMR/CNRS 8638, Faculté de Pharmacie, 4 Avenue de l’Observatoire, F-75006 Paris, France
3. Molecular Medicine, Beckman Research Institute, City of Hope Comprehensive Cancer Center, 500 East Duarte Road, Duarte, 91010 California, United States
4. Centre de Recherche de Gif, Institut de Chimie des Substances Naturelles, CNRS, 1, Avenue de la Terrasse, 91198 Gif-sur-Yvette Cedex, France
5. Department of Chemistry, University of Malaya, 59100 Kuala Lumpur, Malaysia