1. Department of Chemistry; Bahir Dar University; Bahir Dar Ethiopia
2. Department of Pharmaceutical Sciences; Tshwane University of Technology; Pretoria South Africa
3. Department of Chemistry; University of Gondar; Ethiopia
4. SAMRC Herbal Drugs Research Unit; Tshwane University of Technology; Pretoria South Africa
5. Department of Chemistry; Tshwane University of Technology; Pretoria South Africa