1. Department of Pharmaceutical Chemistry and Pharmacognosy, School of Pharmacy, College of Health Science, Addis Ababa University, P.o.Box. 1176, Addis Ababa, Ethiopia
2. Department of Pharmaceutics and Social Pharmacy, School of Pharmacy, College of Health Science, Addis Ababa University, P.o.Box. 1176, Addis Ababa, Ethiopia