1. State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, P. R. China
2. Department of Chemistry and Biochemistry, University of California, Los Angeles California 90095, United States
3. University of Chinese Academy of Sciences, Beijing 100049, P. R. China
4. School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, P. R. China