1. Department of Chemistry, University of Karachi, Main University Road, Karachi, Pakistan
2. Department of Applied Chemistry, University of Karachi, Main University Road, Karachi, Pakistan
3. Division of Geochronology and Environmental Isotopic Research, Silesian University of Technology, Gliwice, Poland
4. Chemistry, School of Science, University of Waikato, Hamilton, New Zealand
5. Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia