1. Department of Chemistry, University of Minnesota, 207 Pleasant Street Southeast, Minneapolis, Minnesota 55455, United States
2. Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47405, United States
3. Department of Medicinal Chemistry, University of Minnesota, 208 Harvard Street Southeast, Minneapolis, Minnesota 55454, United States
4. Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, 321 Church Street Southeast, Minneapolis, Minnesota 55454, United States