1. Department of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Gezira, Wad Madani 21111, Sudan
2. Department of Molecular Biotechnology, Hochschule Anhalt, 06846 Dessau-Roßlau, Germany
3. Department of Biology, College of Science and Technology, Florida A & M University, Tallahassee, FL 32307, USA
4. Department of Pharmacognosy, Faculty of Pharmacy, University of Khartoum, Khartoum 11114, Sudan
5. Department of Pharmacognosy, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia