1. Department of Chemistry , Faculty of Science , The University of Bamenda , P.O. Box 39, Bambili , Cameroon , Phone: (+237) 677 95 56 30
2. Department of Organic Chemistry , Faculty of Science , University of Yaoundé I , P.O. Box 812 , Yaoundé , Cameroon
3. Department of Chemistry , Faculty of Science , Scientific and Technical University of Masuku, Box 943 , Franceville , Gabon
4. Department of Chemistry , Higher Teacher Training College , University of Maroua, P.O. Box 55 , Maroua , Cameroon
5. H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences , University of Karachi , Karachi 75270 , Pakistan
6. Department of Chemistry , Karakoram International University , 15100-Gilgit, Gilgit-Baltistan , Pakistan
7. Pharmaceutical Research Centre of Pakistan , Council of Scientific and Industrial Research Laboratories Complex , Karachi 75280 , Pakistan
8. Department of Chemistry, Higher Teacher Training College , University of Yaoundé I , P.O. Box 47 , Yaoundé , Cameroon , Phone: (+237) 675 097 561