1. Sharjah Institute for Medical Research, University of Sharjah, P.O. Box 27272, Sharjah, UAE
2. Department of Chemistry, University of Jordan, 11942 Amman, Jordan
3. College of Pharmacy, University of Sharjah, P.O. Box 27272, Sharjah, UAE
4. Temple University, Department of Chemistry, 201 Beury Hall, Philadelphia, Pennsylvania 19122, United States