1. Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, Innovative Drug Research Center, School of Pharmaceutical Sciences, Chongqing University, Chongqing 401331, P. R. China
2. Pharmaceutical Department, Chongqing University Three Gorges Hospital, Chongqing University, Chongqing 404100, P. R. China
3. Chemical Biology Research Center, School of Pharmaceutical Sciences, Chongqing University, Chongqing 401331, P. R. China
4. Beijing National Laboratory for Molecular Sciences, Beijing 100190, P. R. China