1. College of Plant Science, Jilin University, Changchun, P. R. China
2. State Key Laboratory of Dao-di Herbs, China Academy of Chinese Medical Sciences, Beijing, P. R. China
3. Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine, Ministry of Education, Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, P. R. China