1. Laboratory of Natural Products and Applied Organic Synthesis (LANAPOS), Department of Organic Chemistry, University of Yaounde I , P.O. Box 812 , Yaounde , Republic of Cameroon
2. Institute of Medical Research and Medicinal Plants Studies (IMPM), Ministry of Scientific Research and Innovation , P.O. Box 13033 , Yaounde , Republic of Cameroon
3. Laboratory of Microbiology and Antimicrobial Substances, Department of Biochemistry, Faculty of Science, University of Dschang , P.O. Box 067 , Dschang , Republic of Cameroon
4. Department of Physics and Astronomy, The University of Manchester , Oxford Road, Manchester, M13 9PL , Oxford , United Kingdom
5. Laboratory of Applied Synthetic Organic Chemistry, Department of Chemistry, Faculty of Science, University of Dschang , P.O. Box 67 , Dschang , Republic of Cameroon