1. Central Department of Chemistry, Tribhuvan University, Kirtipur, Kathmandu 44618, Nepal
2. Department of Chemistry, Oklahoma State University, Stillwater, OK 74078, USA
3. Center for Drug Design and Molecular Simulation Division, Cancer Care and Research Center, Kathmandu, Nepal
4. Department of Chemistry, Florida Agricultural and Mechanical University, Tallahassee, FL 32307, USA