1. State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica; Chinese Academy of Medical Sciences and Peking Union Medical College; 1 Xian Nong Tan Street Beijing 100050 People's Republic of China
2. College of Life and Environmental Sciences; Minzu University of China; 27 Zhong Guan Cun Southern Street Beijing 100081 People's Republic of China