1. School of Chinese Medicine, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong
2. The Key Laboratory of Chemistry for Natural Products of Guizhou Province and Chinese Academy of Sciences, Guiyang, Guizhou Province, China
3. Zunyi Medical College, Zunyi, Guizhou Province, China
4. State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
5. Guiyang College of Traditional Chinese Medicine, Guiyang, Guizhou Province, China