1. Department of Pharmacotoxicology, Faculty of Medicine and Biomedical Sciences, University of Yaoundé I, Yaoundé, Cameroon
2. Department of Organic Chemistry, Faculty of Science, University of Yaoundé I, Yaoundé, Cameroon
3. Department of Chemistry, Faculty of Science, University of Botswana, Gaborone, Botswana
4. Department of Biochemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
5. Department of Chemistry, Higher Teacher Training College, University of Yaoundé I, Yaoundé, Cameroon