1. Department of Chemistry, Faculty of Science, University of Maroua, Maroua, Cameroon
2. Department of Biological Sciences, Faculty of Science, University of Maroua, Maroua, Cameroon
3. Department of Life and Earth Sciences, Higher Teacher’s Training College of Maroua, University of Maroua, Maroua, Cameroon
4. Department of General, Organic Chemistry and Biomedical, Laboratory of NMR and molecular Imaging, University of Mons, Mons, Belgium
5. Department of Chemistry, Faculty of Science, University of Ngaounere, Ngaoundere, Cameroon