1Department of Chemistry, University of Minnesota, Minneapolis, MN 55455, USA
2Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, Minneapolis, MN 55455, USA
3Department of Medicinal Chemistry, Institute for Therapeutics Discovery and Development, University of Minnesota, Minneapolis, MN 55455, USA
4Department of Chemistry and Biochemistry, University of California at San Diego, La Jolla, CA, 92093, USA
5Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, MN 55455, USA