1. State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China
2. Research Unit of Chemical Biology of Natural Anti-Virus Products, Chinese Academy of Medical Sciences, Beijing, 100730, China
3. Yunnan Institute of Materia Medica, Kunming 650111, China
4. Jealott's Hill International Research Centre, Syngenta, Bracknell, Berkshire RG42 6EY, UK
5. The Key Laboratory of Chemistry for Natural Products of Guizhou Province and Chinese Academy of Sciences, Guiyang 550014, China