1. Antibiotics Research and Re-evaluation Key Laboratory of Sichuan Province
2. Sichuan Industrial Institute of Antibiotics
3. Chengdu University
4. Chengdu
5. P. R. China
6. Institute fuer Organische und Biomolekular Chemie
7. Georg-August-Universitaet Goettingen
8. 37077 Goettingen
9. Germany
10. College of Pharmacy and Biological Engineering Chengdu University