1. Department of Chemistry and Centre of Advanced Studies in Chemistry Panjab University Chandigarh 160014 India
2. Mehr Chand Mahajan DAV College for Women, Sector 36 Chandigarh 160036 India
3. Department of Applied Chemistry National Chiao-Tung University Hsinchu Taiwan
4. Department of Medicinal and Applied Chemistry Kaohsiung Medical University Kaohsiung 807-08 Taiwan
5. National Interdisciplinary Centre of Vaccine Immunotherapeutics and Antimicrobials Panjab University Chandigarh 160014 India