1. Department of Pharmacognosy, College of Pharmacy, King Saud University, P.O. Box 2457, Riyadh 11451, Kingdom of Saudi Arabia
2. Department of Drug Radiation Research, National Center for Radiation Research & Technology, Atomic Energy Authority, P.O. Box, 29, Nasr City, Cairo, Egypt
3. Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, P. O. Box 2457, Riyadh 11451, Saudi Arabia
4. Department of Medicinal Chemistry, Faculty of Pharmacy, University of Mansoura, Mansoura 35516, Egypt