1. Laboratory of Applied Synthetic Organic Chemistry, Department of Chemistry, Faculty of Science, University of Dschang, P.O. Box 67, Dschang, Cameroon
2. Department of Organic Chemistry, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon
3. Laboratory of Microbiology and Antimicrobial Substances, Department of Biochemistry, Faculty of Science, University of Dschang, P.O. Box 067, Dschang, Cameroon
4. Laboratory of Analytical and Molecular Chemistry, Polydisciplinary Faculty of Safi, Cadi Ayyad University, Route Sidi Bouzid, BP 4162, 46000 Marrakech-Safi, Morocco