1. College of Pharmacy, Fujian University of Traditional Chinese Medicine, Fuzhou, P.R. China
2. Key Laboratory of Tropical Medicinal Resource Chemistry of Ministry of Education, Hainan Normal University, Haikou, P. R. China
3. Key Laboratory of Southern Medicinal Plants Resources of Haikou City, Hainan Normal University, Haikou, P.R. China
4. State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing, P. R. China