1. Laboratory for Bioanalytical Chemistry, Institute of Chemistry, University of Neuchatel, Avenue de Bellevaux 51, CH-2000 Neuchâtel, Switzerland
2. Department of Bioorganic Chemistry, Max Planck Institute for Chemical Ecology, Hans-Knoell-Straße 8, D-07745 Jena, Germany
3. Institute for Biological Sciences, University of Rostock, Albert-Einstein-Straße 3, D-18059 Rostock, Germany