1. Department of Chemistry, Arba Minch University, P.O. Box 21, Arba Minch, Ethiopia
2. Department of Chemistry, College of Natural and Computational Sciences, Mekelle University, P.O. Box 3055, Mekelle, Ethiopia
3. SBMN Institute of Pharm. Sciences and Research, Baba Mastnath University, Asthal-Bohar, Rohtak, Haryana 124021, India