1. Department of Pharmacology, School of Basic Medical Science, Beijing (Peking) University, Beijing, PR China,
2. Department of Chemical Biology, School of Pharmaceutical Sciences, Beijing (Peking) University, Beijing, PR China,
3. State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Beijing (Peking) University, Beijing, PR China, and
4. Department of Drug Metabolism & Pharmacokinetics, Biogen, Cambridge, MA, USA