1 Centre for Research on Medicinal Plants and Traditional Medicine, Institute of Medical Research and Medicinal Plants Studies, Yaoundé, Cameroon.
2 Laboratory of Pharmacognosy, Department of Pharmacological and Biomolecular, Sciences, Università Degli Studi di Milano, Milan, Italy.
3 Department of Biochemistry, Faculty of Sciences, University of Dschang, Dschang, Cameroon.
4 Department of Biology, Chemistry and Forensic Science, School of Sciences, Faculty of Science and Technology, University of Wolverhampton, Wolverhampton, United Kingdom.