1. State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University Guiyang Guizhou 550014 China
2. The Key Laboratory of Chemistry for Natural Products of Guizhou Province and Chinese Academy of Sciences Guiyang Guizhou 550014 China
3. State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences Kunming Yunnan 650201 China