1. School of Pharmacy, Shanghai Jiao Tong University, Shanghai, P. R. China
2. Key Laboratory of Animal Parasitology, Ministry of Agriculture, Shanghai Veterinary Research Institute, Shanghai, P. R. China
3. College of Pharmaceutical Sciences and Chinese Medicine, Southwest University, Chongqing, P. R. China
4. Department of Phytochemistry, Second Military Medical University, Shanghai, P. R. China