1. Department of Chemistry, Quaid-i-Azam University, Islamabad, Pakistan
2. Department of Chemistry, Howard University, Washington, DC, USA
3. Department of Drug Control, National Institute of Health, Islamabad, Pakistan
4. Department of Chemistry, Clemson University, Clemson, SC, USA
5. Department of Chemistry, The Islamia University of Bahawalpur, Bahawalpur, Pakistan