1. H.E.J. Research Institute of Chemistry
2. International Center for Chemical and Biological Sciences
3. University of Karachi
4. Karachi-75270
5. Pakistan
6. Section of Organic Chemistry and Biochemistry
7. Department of Chemistry
8. University of Ioannina
9. Ioannina
10. Greece
11. Panjwani Center for Molecular Medicine and Drug Research