1. Department of Chemical Engineering, School of Chemical Engineering and
Mineral Industries, University of Ngaoundere, Ngaoundere, Cameroon
2. Center for Natural Products Research, Chengdu Institute of Biology,
Chinese Academy of Sciences, Chengdu, China
3. Department of Biochemistry, Faculty of Science, University of Yaoundé
I, Yaoundé, Cameroon
4. Department of Bioorganic Chemistry, Leibniz Institute of Plant
Biochemistry, Halle (Saale), Germany
5. Department of Biological Chemistry and Molecular Pharmacology, Harvard
Medical School, Boston, USA
6. Department of Organic Chemistry, Faculty of Science, University of
Yaoundé I, Yaoundé, Cameroon