1. Department of Natural Products, Faculty of Pharmacy, King Abdulaziz University, Jeddah 21589, Kingdom of Saudi Arabia. Fax: +9 66-2-6 95 16 96
2. Department of Pharmacognosy, Faculty of Pharmacy, Cairo University, Cairo 11562, Egypt
3. Department of Metabolic Engineering, Institute of Natural Medicine, University of Toyama, Sugitani 2630, Japan
4. Department of Pharmacology, Faculty of Veterinary Medicine, Cairo University, Cairo 12211, Egypt