1. Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, Kansas 66045, United States, The University of Kansas Center for Chemical Methodologies and Library Development (KU-CMLD), 2034 Becker Drive, Delbert M. Shankel Structural Biology Center, Lawrence, Kansas 66047, United States, and H. E. J. Research Institute of Chemistry, International Center for Chemical and Biological Science, University of Karachi, Karachi, Pakistan