1. 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
2. Chengdu Institute of Drug and Food Control, Chengdu 610045, P R China
3. Syngenta Jealott's Hill International Research Centre, Berkshire RG42 6EY, UK