1. Department of Organic Chemistry, Faculty of Science, University of Yaounde I, Yaounde, Cameroon
2. Department of
Chemistry, Hayden Dr. Virginia State University, Petersburg VA, 23803, USA
3. H.E.J. Research Institute of Chemistry,
International Center for Chemical and Biological Sciences, University of Karachi, Karachi 75270, Pakistan
4. Department of Biology, Institute for Biomedical Sciences, Baylor University, Waco, TX, 76798, USA