1. Department of Chemistry, Faculty of Science, University of Dschang, PO Box 67 Dschang, Cameroon, Department of Organic Chemistry, Faculty of Science, University of Yaounde I, PO Box 812, Yaounde, Cameroon, International Centre for Chemical Sciences, HEJ Research Institute of Chemistry, University of Karachi, Karachi 75270, Pakistan, Department of Chemistry and Biochemistry, Rand Afrikaans University, PO Box 524, Auckland Park 2006, South Africa, Division of Applied Plant Sciences, Sangji University,...