1. Department of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky, Lexington, Kentucky 40536, United States
2. Department of Chemistry, Institute of Organic and Biomolecular Chemistry, Georg-August-University, GöTammannstr. 2, 37077 Göttingen, Germany
3. Department of Pharmacy, Pharmaceutical and Medicinal Chemistry, Saarland University, Campus C2 3, 66123 Saarbrücken, Germany