1. Jinhua Branch Sichuan Industrial Institute of Antibiotics Chengdu University Chengdu 610106 P. R. China
2. Antibiotics Research and Re-evaluation Key Laboratory of Sichuan Province Sichuan Industrial Institute of Antibiotics, School of Pharmacy Chengdu University Chengdu 610106 P. R.China
3. College of Pharmacy Jinhua Polytechnic Jinhua 321007 P. R. China