1. Department of Chemistry University of Karachi Karachi 75270 Pakistan
2. Department of Chemistry Federal Urdu University of Art Science and Technology Karachi Pakistan
3. H. E. J. Research Institute of Chemistry International Center for Chemical and Biological Sciences University of Karachi Karachi 75270 Pakistan
4. Department of Clinical Pharmacy Institute for Research and Medical Consultations (IRMC) Imam Abdulrahman Bin Faisal University P.O. Box 1982 Dammam 31441 Saudi Arabia