1. College of Chemistry and Environmental Science, Hebei University, Baoding, 071002, P. R. China
2. Key Laboratory of Medicinal Chemistry and Molecular Diagnosis (Hebei University), Ministry of Education, Key Laboratory of Chemical Biology of Hebei Province, Hebei University, Baoding, 071002, P. R. China
3. State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China