1. Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, P. R. China
2. Laboratory of Natural Product Drugs, State Key Laboratory of Biotherapy and Cancer Center, West China Medical School, West China Hospital, Sichuan University, Chengdu 610041, People’s Republic of China
3. The Ministry of Education Key Laboratory of Standardization of Chinese Herbal Medicine, State Key Laboratory, Breeding Base of Systematic Research Development and Utilization of Chinese Medicine Resources, School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu 611137, P. R. China
4. Syngenta Jealott’s Hill International Research Centre, Berkshire RG42 6EY, U.K.