1. Institute of Pharmaceutical Sciences, Faculty of Chemistry and Pharmacy, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Straße 9, D-79104 Freiburg, Germany
2. Institute of Organic Chemistry, Faculty of Chemistry and Pharmacy, Albert-Ludwigs-Universität Freiburg, Albertstraße 21, D-79104 Freiburg, Germany
3. Molecular Preventive Medicine, University Medical Center and Faculty of Medicine, Albert-Ludwigs-Universität Freiburg, Engesserstaße 4, D-79108 Freiburg, Germany