1. Department of Organic Chemistry, Faculty of Science, University of Yaoundé I , Yaoundé, Cameroon
2. Department of Pharmaceutical Biology, Institute of Pharmacy and Biochemistry, University of Mainz , Mainz, Germany
3. Department of Biochemistry, Faculty of Science, University of Dschang , Dschang, Cameroon
4. Department of Chemistry, Cankiri Karatekin University , Istanbul, Turkey
5. Department of Chemistry, Faculty of Science, University of Botswana , Gaborone, Botswana
6. Department of Pharmacognosy and Pharmaceutical Chemistry, Faculty of Medicine and Biomedical Science, University of Yaoundé I , Yaoundé, Cameroon