1. H. E. J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences; University of Karachi; Karachi 75270 Pakistan
2. Dr. Panjwani Center for Molecular Medicine and Drug Research, International Center for Chemical and Biological Sciences; University of Karachi; Karachi 75270 Pakistan
3. School of Pharmacy; University of East Anglia; Norwich Research Park Norwich NR4 7TJ UK