1. Institute of Medical Research and Medicinal Plants Studies, Yaounde, Cameroon
2. Department of Organic Chemistry, Faculty of Science, University of Yaounde I, Yaounde, Cameroon
3. Institut Supérieur des Sciences de la Santé, Université des Montagnes, Bangangte, Cameroon
4. Laboratory of Pharmacognosy, Department of Pharmacy, CIRM, University of Liege, Liege, Belgium