1. Department of Chemistry, National Institute of Technology, Tiruchirappalli 620 015, India
2. Theoretical and Computational Chemistry Laboratory, School of Chemistry, Bharathidasan University, Tiruchirappalli 620 024, India
3. Department of Chemistry, Siddha Central Research Institute, Central Council for Research in Siddha, Arumbakkam, Chennai 600 106, India
4. Division of Natural Drug Discovery, Institute of Natural Medicine, University of Toyama, 2630 Sugitani, Toyama 930-0194, Japan
5. Department of Chemistry, Texas A&M University, College Station, Texas 77842, United States