1. Department of Chemistry, Oklahoma State University, 107 Physical Science, 74078 Stillwater, Oklahoma, United States
2. Institut für Organische Chemie, Universität Regensburg, Universitätstrasse 31, 93053 Regensburg, Germany
3. Center for Drug Design, College of Pharmacy, University of Minnesota, 7-158 Phillips Wangensteen Building, 516 Delaware Street SE, Minneapolis, Minnesota 55455, United States