1. Department of NMR, All India Institute of Medical Sciences, New Delhi 110029, India
2. UJ Nanomaterials Science Research Group, University of Johannesburg, P.O. Box 17011, Doornfontein, Johannesburg 2028, South Africa
3. Alternative Therapeutics Unit, Drug Discovery & Development Division, Medicinal Research Lab, Department of Chemistry, University of Allahabad, Allahabad 211002, India
4. Department of Biochemistry, University of Allahabad, Allahabad 211002, India
5. Department of Chemistry, State University of New York, 1 Hawk Drive, New Paltz, NY 12561, USA