1. Department of Bioorganic Chemistry, Max Planck Institute for Chemical Ecology, Hans-Knoell Strasse 8, D-07745 Jena, Germany
2. Department for Integrative Evolutionary Biology, Max Planck Institute for Developmental Biology, Max-Planck-Ring 9, D-72076 Tübingen, Germany
3. Department of Biology and Biotechnology, Worcester Polytechnic Institute, 60 Prescott Street, Worcester, Massachusetts 01605, United States
4. Laboratory of Bioanalytical Chemistry, University of Neuchatel, Avenue de Bellevaux 51, CH-2000 Neuchâtel, Switzerland