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