1. Faculty of Science, Department of Organic Chemistry, University of Yaoundé I, Yaoundé, Cameroon
2. Faculty of Medicine and Biomedical Science, Department of Pharmacognosy and Pharmaceutical Sciences, University of Yaoundé I, Yaoundé, Cameroon
3. Laboratory of chemical Biology, The United Graduate School of Agricultural Sciences, Iwate University, Morioka, Japan
4. Research and Analytical Center for giant Molecules, Graduate School of Science, Tohoku University, Sendai, Japan
5. Green Asia Education Center, Kyushu University, Fukuoka, Japan
6. Faculty of Agriculture, Department of Food, Life, and Environmental Science, Yamagata University, Tsuruoka, Japan
7. Faculty of Science, Department of Chemistry, University of Dschang, Dschang, Cameroon
8. Faculty of Science, Department of Chemistry, University of Botswana, Gaborone, Botswana