1 Department of Chemistry and Centre of Advanced Studies in Chemistry, Panjab University, Chandigarh 160014, India.
2 National Interdisciplinary Centre of Vaccines, Immunotherapeutics and Antimicrobials (NICOVIA), Panjab University, Chandigarh 160 014, India.
3 Vanderbilt Institute of Chemical Biology Program in Drug Discovery, Department of Pharmacology, Vanderbilt Medical Center, Nashville, Tennessee 37232, United States.