1. Faculty of Science, Department of Organic Chemistry, University of Yaoundé 1, Yaoundé, Cameroon
2. International Center for Chemical and Biological Sciences, H.E.J Research Institute of Chemistry, University of Karachi, Karachi, Pakistan
3. Department of Chemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
4. Department of Chemistry, Higher Teacher’s Training College, University of Yaoundé 1, Yaoundé, Cameroon
5. Department of Chemistry, University of Pretoria, Hatfield, South Africa