1. Department of Chemical Biology, Peking University School of Pharmaceutical Sciences, 38 Xueyuan Road, Beijing
100191, P.R. China
2. Beijing
Synchrotron Radiation
Facility and 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