1. Antibiotics Researchand Re-evaluation Key Laboratory of Sichuan ProvinceSichuan Industrial Institute of AntibioticsChengdu University 168 Hua Guan Road Chengdu 610052 P. R. China
2. College of Pharmaceutics and Materials EngineeringJinhua Polytechnic 888 West Hai Tang Road Jinhua 321007 P. R. China
3. Jinhua Branch of Sichuan Industrial Institute of Antibiotics 888 West Hai Tang Road Jinhua 321007 P. R. China