1. School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
2. School of Applied Chemistry, Shenyang University of Chemical Technology, Shenyang 110000, P. R. China
3. State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing 100191, P. R. China
4. State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, P. R. China