1. Department of Pharmacogonosy, College of Pharmacy, King Saud University, Riyadh, PO Box 2457, Riyadh 11451, Saudi Arabia
2. International Center for Chemical and Biologic al Sciences, H.E.J. Research Institute of Chemistry, University of Karachi, Karachi-75270, Pakistan
3. Department of Botany, Balochistan University, Sariab Road, Quetta, Pakistan