1. Department of Chemistry; Tsinghua University; Beijing 100084 People's Republic of China
2. The Ministry-Province Jointly Constructed Base for State Key Lab-Shenzhen Key Laboratory of Chemical Biology; The Graduate School at Shenzhen, Tsinghua University; Shenzhen 518055 People's Republic of China
3. Institutes of Biomedical Sciences, Fudan University; Shanghai 200032 People's Republic of China
4. Department of Pharmacology and Pharmaceutical Sciences; School of Medicine, Tsinghua University; Beijing 100084 People's Republic of China