1. State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650204, People's Republic of China
2. University of Chinese Academy of Sciences, Yuquan Road 19, Beijing 100049, People's Republic of China
3. Yunnan Key Laboratory of Natural Medicinal Chemistry, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, People's Republic of China
4. College of Pharmacy, Kunming Medical University, Chunrong West Road 1168, Kunming 650500, People's Republic of China