1. NMR/Biosynthesis Group, Max Planck Institute for Chemical Ecology, Jena 07745, Germany
2. Technische Universität Braunschweig, Institute of Pharmaceutical Biology, Braunschweig 38106, Germany
3. Department of Natural Product Biosynthesis, Max Planck Institute for Chemical Ecology, Jena 07745, Germany
4. Department of Insect Symbiosis, Max Planck Institute for Chemical Ecology, Jena 07745, Germany
5. Department of Biochemistry, Max Planck Institute for Chemical Ecology, Jena 07745, Germany
6. Jiangsu Key Laboratory for the Research and Utilization of Plant Resources, Institute of Botany, Jiangsu Province and Chinese Academy of Sciences (Nanjing Botanical Garden Mem. Sun Yat-Sen), Nanjing 210014, China