1. Department of Chemistry, Faculty of Sciences, University of Ngaoundere, Ngaoundere, Cameroon
2. Department of Chemical Engineering, School of Chemical Engineering and Mineral Industries, University of Ngaoundere, Ngaoundere, Cameroon
3. Department of Chemistry, Physics and Environment, Faculty of Sciences and Environment, ‘Dunarea de Jos’ University, Galati, Romania
4. Department of Biological Sciences, Faculty of Science, University of Ngaoundere, Ngaoundere, Cameroon
5. Department of Organic Chemistry, Faculty of Sciences, University of Yaounde 1, Yaounde, Cameroon
6. Laboratory of NMR and Molecular Imaging, Department of General, Organic Chemistry and Biomedical, University of Mons, Mons, Belgium