1. States Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China
2. Guangxi Key Laboratory of Medicinal Resources Protection and Genetic Improvement, Guangxi Botanical Garden of Medicinal Plant, Nanning 530023, China
3. University of Chinese Academy of Sciences, Beijing 100049, China
4. School of Pharmaceutical Sciences, Peking University Health Science Center, Peking University, Beijing 100191, China
5. Laboratory of Metabolism, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892, United States