1. Department of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Khartoum , P.O. Box 1996 , Khartoum , Sudan
2. Department of Pharmaceutical Chemistry, College of Pharmacy, Karary University , P.O. Box 11111 , Khartoum , Sudan
3. Department of Pharmaceutical Chemistry, Faculty of Clinical Pharmacy, Ibn Sina University , P.O. Box 11111 , Khartoum , Sudan
4. Department of Molecular biology, Institute of Endemic Disease, Faculty of Medicine, University of Khartoum , P.O. Box 11111 , Khartoum , Sudan
5. Department of Pharmacognosy, Faculty of Pharmacy, University of Khartoum , P.O. Box 1996 , Khartoum , Sudan
6. Department of Pharmacognosy, College of Pharmacy, King Saud University , Riyadh , Saudi Arabia
7. Department of Biology, Faculty of Pharmacy, Florid A&M University , Tallahassee , FL , USA