Nan Wang1, Ji-Xia Ren2, Yong Xie2. 1. a Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine, Ministry of Education, Institute of Medicinal Plant Development , Chinese Academy of Medical Science, Peking Union Medical College , 151 Malianwa North Road, Haidian District, Beijing 100193 , PR China. 2. b College of Life Science , Liaocheng University , Liaocheng 252059 , PR China.