1. Faculty of Science, Department of Organic Chemistry, University of YaoundéI 1, Yaoundé, Cameroon
2. Department of Chemistry, COMSATS University Islamabad, Abbottabad, Pakistan
3. Department of Chemie, Universität of Fribourg, Fribourg, Switzerland
4. Department of Chemistry, Higher Teacher’s Training College, University of YaoundéI 1, Yaoundé, Cameroon
5. Faculty of Science, Department of Microbiology, University of Yaoundé I, Yaoundé, Cameroon