Acknowledgements
Authors are highly thankful to the Department of Chemistry and the Department of Pharmaceutical Sciences, Dr H.S. Gour Vishwavidyalaya, Sagar, M.P. India, for providing necessary laboratory facilities. One of the authors is thankful to UGC-RGNF (FI-17.1/2011-12 RGNF-SC-MAH-7199/SA III-Website), New Delhi, for financial assistance.