1. Department of Organic Chemistry, Higher Teachers’ Training College, University of Yaounde I, P.O. Box 47, Yaounde, Cameroon, HEJ Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi 75270, Pakistan, National Center for Natural Products Research, School of Pharmacy, University of Mississippi, University, Mississippi 38677, United States, Department of Organic Chemistry, Faculty of Science, University of Yaounde I, P.O. Box 812, Yaounde,...