1. Department of Organic Chemistry, Faculty of Science, University of Yaounde I, Yaounde, Cameroon
2. Department of Fundamental Science, Higher Technical Teachers’ Training College, University of Bamenda, Bamenda, Cameroon
3. Department of Chemistry, Faculty of science and Medicine, University of Fribourg, Fribourg, Switzerland
4. Department of Biochemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
5. Department of Chemistry, Higher Teachers’ Training College, University of Yaounde I, Yaounde, Cameroon