1. Department of Organic Chemistry, Faculty of Sciences, University of Yaoundé 1, Yaoundé, Cameroon
2. H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi, Pakistan
3. Department of Materials Engineering, School of Chemical Engineering and Mineral Industries, University of Ngaoundéré, Ngaoundéré, Cameroon
4. Dr. Panjwani Center for Molecular Medicinal & Drug Research (PCMD), International Center for Chemical and Biological Sciences (ICCBS), University of Karachi, Karachi, Pakistan