1. a Department of Chemistry , Aligarh Muslim University , Aligarh , Uttar Pradesh , India
2. b Department of Chemistry , Centre for Supramolecular Chemistry Research, University of Cape Town , Cape Town , South Africa
3. c Carlson School of Chemistry and Biochemistry , Clark University , Worcester , MA , USA
4. d Department of Kulliyat, Faculty of Unani Medicine , Aligarh Muslim University , Aligarh , Uttar Pradesh , India