1. a Department of Pharmaceutical Analysis , College of Pharmaceutical Sciences, Andhra University , Visakhapatnam , Andhra Pradesh , India
2. b Organic Chemistry Division-II , Indian Institute of Chemical Technology (IICT), Tarnaka , Secunderabad , India
3. c Department of Pharmaceutical Chemistry , Malla Reddy College of Pharmacy , Maisammaguda , Andhra Pradesh, Secunderabad , India