1. State Key Laboratory of Phytochemistry and Plant Resources in West China Kunming Institute of Botany, Chinese Academy of Sciences, Yunnan Key Laboratory of Natural Medicinal Chemistry Kunming Yunnan 650201 China
2. University of Chinese Academy of Sciences Beijing 100049 China
3. College of Pharmacy and Tianjin Key Laboratory of Molecular Drug Research Nankai University Tianjin 300071 China