Department of Chemistry;
Tripura University;
Suryamaninagar 799130;
Agartala;
India;
Department of Chemistry;
MBB College 799004;
Agartala;
India;
Department of Chemistry;
Iswarchandra Vidyasagar College;
Belonia 799155;
South Tripura;
India;
School of Pharmaceutical Sciences;
Kitasato University;
5-9-1 Shirokane;
Minato-ku;
Tokyo 108 8641;
Japan;