1. Department of Neurosurgery, Zhongnan Hospital of Wuhan University, School of Pharmaceutical Sciences, Wuhan University, Wuhan 430071, China
2. Ministry of Education Key Laboratory of Combinatorial Biosynthesis and Drug Discovery, School of Pharmaceutical Sciences, Wuhan University, Wuhan 430071, China
3. Department of Medicinal Chemistry, School of Pharmacy, Fourth Military Medical University, Xian 710032, PR China
4. Department of Physics and Astronomy, Uppsala University, Box 516, Uppsala SE-751 20, Sweden
5. Guangdong Province Key Laboratory of Pharmacodynamic Constituents of TCM and New Drugs Research, Institute of Traditional Chinese Medicine and Natural Products, College of Pharmacy, Jinan University, Guangzhou 510632, China