1. Department of Organic Chemistry, Faculty of Science, The University of Yaoundé 1, Yaoundé, Cameroon
2. Department of Chemistry, Higher Teacher Training College, The University of Yaoundé 1, Yaoundé, Cameroon
3. Department of Chemical Engineering, School of Chemical Engineering and Mineral Industries, University of Ngaoundéré, Ngaoundéré, Cameroon
4. Department of Biochemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
5. Chemistry Department, Organic and Bioorganic Chemistry, Bielefeld University, Bielefeld, Germany
6. Department of Chemistry, Higher Teacher Training College, University of Bamenda, Bambili, Cameroon