1. Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, Michigan 48202, United States
2. Institut für Medizinische Mikrobiologie, Universität Zürich, Gloriastrasse 28/30, 8006 Zürich, Switzerland
3. Kresge Hearing Research Institute, Department of Otolaryngology, University of Michigan, 1150 West Medical Center Drive, Ann Arbor, Michigan 48109, United States
4. Laboratorium für Organische Chemie, ETH Zürich, Vladimir-Prelog-Weg 1-5/10, 8093 Zürich, Switzerland