1. Laboratory of Phytochemistry, Centre for Research on Medicinal Plants and Traditional Medicine, Institute of Medical Research and Medicinal Plants Studies (IMPM), Yaounde, Cameroon
2. Faculty of Science, Department of Chemistry, University of Dschang, Dschang, Cameroon
3. Laboratory of Pharmacognosy, Department of Pharmacy, CIRM, University of Liege, Liege, Belgium
4. Laboratoire C-TAC, UMR CNRS 8638, Faculté de Pharmacie, Université Paris Descartes, Paris, France