1. Department of Medicinal Chemistry, Department of Pharmaceuticals, Ministry of Chemicals & Fertilizers, National Institute of Pharmaceutical Education and Research, Guwahati, (NIPER Guwahati) Govt. of India, Sila Katamur (Halugurisuk), P.O.: Changsari, Dist: Kamrup, 781101 Guwahati, Assam, India