1. Department of Chemistry, College of Natural and Computational Sciences, University of Gondar, Gondar, Ethiopia
2. Department of Pharmaceutical Sciences, Tshwane University of Technology, Pretoria, South Africa
3. Department of Chemistry, College of Natural Sciences, Addis Ababa University, Addis Ababa, Ethiopia
4. Department of Chemistry, Tshwane University of Technology, Pretoria, South Africa
5. Department of Chemistry, Bahir Dar University, Bahir Dar, Ethiopia