1. Biology Department, Faculty of Science and Arts-Khulais, King Abdulaziz University, Khulais, Saudi Arabia
2. Pharmacognosy Division, Department of Medicinal Chemistry, Biomedical Centre, Uppsala University, Box 574, SE-751 24 Uppsala, Sweden
3. Marine Toxins Laboratory, Food Toxins and Contaminants Department, National Research Centre, Dokki, Cairo, Egypt
4. H.E.J. Research Institute of Chemistry, International Center for Chemical Sciences, University of Karachi, Karachi 75270, Pakistan
5. Department of Experimental Hematology, Karolinska University Hospital, SE-141 86 Stockholm, Sweden
6. Centre for Natural Products and Drug Discovery (CENAR), Chemistry Department, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia