1. Institute of Organic Chemistry, University of Vienna, Währingerstrasse 38, A-1090 Vienna, Austria
2. Institute of Pharmaceutical Sciences, Pharmaceutical (Bio-)Analysis, Eberhard-Karls-University Tübingen, Auf der Morgensstelle 8, 72076 Tübingen, Germany
3. Department of Life Science and Biotechnology, University of Ferrara, via L. Borsari 46, 44121 Ferrara, Italy