1. Institute of Pharmacy, University of Regensburg, Universitätsstraße 31, Regensburg 93053, Germany
2. Department of Medicinal Chemistry, Institute for Therapeutics Discovery and Development, University of Minnesota, Minneapolis, Minnesota 55414, United States
3. Department of Neurology, University of Minnesota, 2101 6th Street SE, Minneapolis 55455, United States
4. Department of Medicinal Chemistry, University of Minnesota, Minneapolis, Minnesota 55414, United States
5. Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, Minnesota 55455, United States