1. Faculty of Science, Department of Organic Chemistry, University of Yaoundé 1, Yaoundé, Cameroon
2. Department of Chemistry, University of Pretoria, Hatfield, South Africa
3. Department of Chemistry, Higher Teacher’s Training College, University of Yaoundé 1, Yaoundé, Cameroon
4. Department of Biochemistry, Genetics, and Microbiology, University of Pretoria, Hatfield, South Africa
5. Faculty of Science, Department of Microbiology, University of Yaoundé I, Yaoundé, Cameroon
6. Center for Studies on Medicinal Plants and Traditional Medicine (CRPMT), Institute of Medical Research and Medicinal Plants Studies (IMPM), Yaoundé, Cameroon