1. Department of Chemical Biology, Peking University School of Pharmaceutical Sciences, 38 Xueyuan Road, Beijing 100191, P.R. China
2. Key Laboratory of Nuclear Analytical
Techniques, Institute of High Energy Physics, Chinese Academy of Sciences, 19B Yuquan
Road, Beijing 100049, P.R. China
3. Shanghai Synchrotron Radiation
Facility, Shanghai Institute of Applied Physics, Chinese Academy of Science, 239 Zhang-Heng
Road, Shanghai 201204, P.R. China