1. State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China
2. University of Chinese Academy of Sciences, Beijing 100049, China
3. Bristol-Myers Squibb Co., Lawrenceville, New Jersey 08648, United States
4. Chemodiversity Research Group, Division of Systematic and Evolutionary Botany, University of Vienna, Rennweg 14, A-1030 Vienna, Austria