1. Department of Biochemistry, Faculty of Science, University of Dschang, Dschang, Cameroon;
2. H. E. J. Research Institute of Chemistry, International Center for Chemical & Biological Sciences (ICCBS), University of Karachi, Karachi, Pakistan;
3. Dr. Panjwani Center for Molecular Medicine and Drug Research (PCMD), International Center for Chemical & Biological Sciences (ICCBS), University of Karachi, Karachi, Pakistan
4. Department of Chemistry, Faculty of Science, University of Dschang, Dschang, Cameroon;