1. Department of Pharmaceutical Chemistry, College of Pharmacy; King Saud University; PO Box 2457 Riyadh 11451 Saudia Arabia
2. Department of Pharmacology Toxicology, College of Pharmacy; King Saud University; PO Box 2457 Riyadh 11451 Saudia Arabia
3. Micro-analytical Laboratory, Applied Organic Chemistry Department; National Research Center; Dokki Cairo Egypt