1. a Department of Pharmacology , Institute of Materia Medica, Peking Union Medical College & Chinese Academy of Medical Sciences , Beijing, 100050, China
2. b Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine, Ministry of Education, Institute of Materia Medica, Peking Union Medical College & Chinese Academy of Medical Sciences , Beijing, 100050, China
3. c Department of Medicinal Chemistry , Institute of Materia Medica, Peking Union Medical College & Chinese Academy of Medical Sciences , Beijing, 100050, China