1. Institute of Pharmacy, University of Jena, Neugasse 23, Jena D-07743, Germany, Institute of Organic and Macromolecular Chemistry, University of Jena, Humboldtstrasse 10, D-07743 Jena, Germany, Institute of Phytopathology, Life Science Center Weihenstephan, Technical University of Munich, Am Hochanger 2, Freising-Weihenstephan D-85350, Germany, and biolitec AG, Winzerlaer Strasse 2, D-07745 Jena, Germany