1. Department of Molecular Ecology, Max Planck Institute for Chemical Ecology, 07745 Jena, Germany
2. Department of Biochemistry, Max Planck Institute for Chemical Ecology, 07745 Jena, Germany
3. Research Group Biosynthesis/NMR, Max Planck Institute for Chemical Ecology, 07745 Jena, Germany
4. Centre for Organismal Studies Heidelberg, 69120 Heidelberg, Germany
5. Institut de Biologie Moléculaire des Plantes, CNRS UPR 2357 Université de Strasbourg, 67084 Strasbourg, France