1. State
Key Laboratory of Bioactive Substances and Functions of Natural Medicines,
Institute of Materia Medica, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing 100050, P.R. China
2. Department
of Medicinal Chemistry, Beijing Key Laboratory of Active Substances
Discovery and Drugability Evaluation, Institute of Materia Medica, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing 100050, P.R. China