1. Department of Chemistry, University of Cologne, Greinstrasse 4, 50939 Köln, Germany
2. Institute for Medical Microbiology, Immunology
and Hygiene, University of Cologne, Goldenfelsstrasse
19-21, 50935 Köln, Germany
3. Institute for Medical Microbiology, Immunology and Parasitology, University of Bonn, Meckenheimer Allee 168, 53155 Bonn,
Germany
4. Bayer CropScience, Research−Chemistry Disease Control, Alfred-Nobel-Strasse 50, 40789 Monheim, Germany