1. State Key Laboratory of Chinese Medicine and Molecular Pharmacology, Shenzhen, P.R. China, Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, SAR Hong Kong, P.R. China, Research Center of Modernization of Chinese Medicines, College of Chemistry and Chemical Engineering, Central South University of Changsha, P.R. China, and Department of Chemistry, University of Bergen, Bergen, Norway