1. Department of Organic Chemistry, Faculty of Science, The University of Yaounde I, Yaounde, Cameroon
2. Department of Chemical Engineering, School of Chemical Engineering and Mineral Industries, University of Ngaoundere, Ngaoundere, Cameroon
3. Department of Medical Services and Techniques, Koycegiz Vocational School of Health Services, Mugla Sitki Kocman University, Mugla, Turkey
4. Department of Refining and Petrochemistry, National Advanced School of Mines and Petroleum Industries, University of Maroua, Kaélé, Cameroon
5. Institute of Medical Research and Medicinal Plants, Ministre de la Recherche Scientifique et de l'Innovation, Yaoundé, Cameroon