1. State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, P. R. China
2. University of Chinese Academy of Sciences, Beijing 100049, P. R. China
3. School of Forestry, Southwest Forestry University, Kunming 650224, P. R. China
4. State Key Laboratory of Southwestern Chinese Medicine Resources, and Innovative Institute of Chinese Medicine and Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu 611137, P. R. China