1. b Department of Pharmacognosy , College of Pharmacy, King Saud University , P.O. Box 2457, Riyadh 11451, Saudi Arabia
2. c Department of Biological Sciences , Philadelphia College of Pharmacy, University of Sciences in Philadelphia , 600 South 43rd Street, Philadelphia, PA 19104-4495, USA
3. a Medicinal, Aromatic and Poisonous Plants Research Center , King Saud University , P.O. Box 2457, Riyadh 11451, Saudi Arabia