1. Institute of Pharmacy, Faculty of Chemistry and Pharmacy, University of Regensburg, Universitätsstrasse 31, 93053 Regensburg, Germany
2. Institute of Chemistry, Faculty of Bioorganic Chemistry, University of Tartu, Ravila 14a, 50411 Tartu, Estonia
3. Institute of Inorganic Chemistry, Faculty of Chemistry and Pharmacy, University of Regensburg, Universitätsstrasse 31, 93053 Regensburg, Germany
4. Department of Chemistry, Johannes-Gutenberg-University Mainz, Düsbergweg 10-14, 55099 Mainz, Germany
5. Institute of Pharmaceutical Sciences, University of Freiburg, Albertstrasse 25, 79104 Freiburg, Germany