1. Institute of Pharmacognosy, University of Vienna, Pharmacy-Center, Althanstrasse 14, A-1090 Vienna, Austria, Institute of Pharmaceutical Chemistry, Karl-Franzens-University Graz, Universitätsplatz 1, A-8010 Graz, Austria, Institute of Pharmaceutical Biology, University of Regensburg, Germany, and Faculty of Natural Sciences IV−Chemistry and Pharmacy, Zentrale Analytik, University of Regensburg, D-93040 Regensburg, Germany