1. Department of Pharmacognosy, Faculty of Pharmacy, University of Alexandria, Alkhartoom Square, Alexandria 21521, Egypt
2. Eugene and Marilyn Glick Eye Institute, Department of Ophthalmology, Indiana University School of Medicine, 1160 W. Michigan St., Indianapolis, Indiana 46202, United States
3. Natural Products Research Group, Department of Chemistry, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford GU2 7XH, United Kingdom
4. Royal Botanic Gardens, Kew, Kew Green, Richmond TW9 3AE, United Kingdom
5. Department of Pharmacology and Toxicology, Indiana University School of Medicine, 1160 West Michigan Street, Indianapolis, Indiana 46202, United States