1. State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, and Chemical Biology Center, Peking University, Beijing 100191, P. R. China
2. School of Life Science, Beijing Institute of Technology, Beijing 100081, P. R. China
3. Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), Department of Radiation Oncology, Peking University Cancer Hospital & Institute, Beijing 100142, P. R. China
4. Shimadzu (China) Co., LTD, Beijing Branch, Beijing 100020, PR China
5. School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, P. R. China