1. Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, Kansas 66045, the KU Chemical Methodologies and Library Development Center of Excellence, University of Kansas, 1501 Wakarusa Drive, Lawrence, Kansas 66047, Deciphera Pharmaceuticals LLC, 1505 Wakarusa Drive, Lawrence, Kansas 66047, and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. of China