1. Department of Chemistry, Faculty of Science, University of Douala
2. Laboratoire de Chimie et Biochimie des Substances Naturelles
3. Pharmacochimie des Substances Naturelles et Pharmacophores Redox, UMR 152 IRD-UPS, Faculté de Pharmacie, Université Paul Sabatier, 35, Chemin des Maraîchers
4. Department of Animals Biology and Physiology, Faculty of Science, University of Yaounde I
5. Department of Organic Chemistry, Faculty of Science, University of Yaounde I