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. State Key Laboratory of Phytochemistry and Plant Resources inWest China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, P. R. China
3. Graduate University of the Chinese Academy of Sciences, Beijing 100049, P. R. China