1. School of Life Sciences Peking University Beijing 100871 P. R. China
2. Beijing National Laboratory for Molecular Sciences State Key Laboratory of Natural and Biomimetic Drugs Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education Department of Chemical Biology College of Chemistry and Molecular Engineering Synthetic and Functional Biomolecules Center, and Peking-Tsinghua Center for Life Sciences Peking University Beijing 100871 P. R. China
3. Department of Chemistry Faculty of Science Chulalongkorn University Bangkok 10330 Thailand