1. Key Laboratory of Coarse Cereal Processing, Ministry of Agriculture and Rural Affairs Chengdu University Chengdu 610106 People's Republic of China
2. Antibiotics Research and Re-evaluation Key Laboratory of Sichuan Province, Sichuan Industrial Institute of Antibiotics Chengdu University Chengdu 610052 People's Republic of China
3. Institut für Organische und Biomolekulare Chemie Georg-August-Universität Tammannstraße 2 37077 Göttingen Germany