1. Laboratory No. 3 of Organic Chemistry, Department of Organic Chemistry, Faculty of Science, University of Yaoundé I, Yaoundé, Cameroon
2. Department of Chemistry, Higher Teacher Training College, University of Bamenda, Bambili, Cameroon
3. Laboratory for Phytobiochemistry and Medicinal Plants Studies, Department of Biochemistry, Faculty of Science, University of Yaoundé I, Yaoundé, Cameroon
4. Department of Biological Sciences, Faculty of Science, University of Maroua, Maroua, Cameroon
5. Department of Materials Engineering/Chemical Engineering, School of Chemical Engineering and Mineral Industries, University of Ngaoundéré, Ngaoundéré, Cameroon
6. NMR and Molecular Imaging Laboratory, Department of General, Organic and Biomedical Chemistry, Faculty of Medicine and Pharmacy, University of Mons, Mons, Belgium
7. Department of Biochemistry, Faculty of Science, University of Douala, Douala, Cameroon