1. Pure and Applied Sciences Department, Faculty of Pure and Applied Sciences and General Studies, Federal College of Dental Technology and Therapy, Enugu, Nigeria
2. Department of Pharmaceutical and Medicinal Chemistry, Faculty of Pharmaceutical Sciences, Nnamdi Azikiwe University, Awka, Nigeria
3. Department of Pharmaceutical Chemistry, Faculty of Pharmaceutical Sciences, University of Benin, Benin Nigeria
4. Institute of Pharmaceutical Biology and Biotechnology, Heinrich-Heine Universitat, Dusseldorf, Germany