1. Departement of Organic Chemistry, Faculty of Science, University of Yaoundé I, Yaoundé, Cameroon
2. Department of Biochemistry, Faculty of Science, University of Yaoundé I, Yaoundé, Cameroon
3. Department of Materials Engineering, School of Chemical Chemical Engineering and Mineral Industries, University of Ngaoundéré, Ngaoundéré, Cameroon
4. Laboratory of NMR and Molecular Imaging, Department of General, Organic Chemistry and Biochemistry, Univerisy of Mons, Mons, Belgium