1. Department of Pharmacognosy, Faculty of pharmacyMansura University Mansura 35516 Egypt
2. Department of Chemistry, College of ScienceKing Saud University P. O. Box 2455 Riyadh 11451 Saudi Arabia
3. Department of Organic and Medicinal chemistry, Faculty of PharmacyUniversity of Sadat City Menoufiya Egypt
4. Department of Medicinal Chemistry, Faculty of PharmacyUniversity of Mansoura Mansoura 35516 Egypt
5. Department of Chemistry, Faculty of ScienceAlexandria University P.O. Box 426 Ibrahimia, Alexandria 21321 Egypt