1. Beijing Key Laboratory of Active Substance Discovery and Druggability Evaluation, Institute of Materia Medica; Peking Union Medical College and Chinese Academy of Medical Sciences; Beijing 100050 China
2. 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 China
3. Natural Products Research Laboratories, UNC Eshelman School of Pharmacy; University of North Carolina; Chapel Hill NC 27599-7568
4. Chinese Medicine Research and Development Center; China Medical University and Hospital; Taichung Taiwan