1. Department of Pharmacognosy, Faculties of Pharmacy, Cairo, Egypt
2. Department of Pharmacognosy, Faculties of Pharmacy, Al-Azhar University, Egypt
3. College of Pharmacy, King Saud University, P.O. Box 2457, Riyadh, 11451, Saudi Arabia
4. Department of Pharmaceutical Sciences, School of Pharmacy, University of Pittsburgh, PA, 15261
5. G.D. Searle Company, Skokie, IL, 60077, USA