1. Antibiotics Research and Re-evaluation Key Laboratory of Sichuan Province
2. Sichuan Industrial Institute of Antibiotics
3. Chengdu University
4. Chengdu 610052
5. P. R. China
6. Institut für Organische und Biomolekulare Chemie
7. Georg-August-Universität Göttingen
8. 37077 Göttingen
9. Germany
10. School of Pharmaceutical Science
11. Jiangnan University
12. 214122 Wuxi