1. College of Pharmacy, Fujian University of Traditional Chinese Medicine, Fuzhou, P. R. China;
2. Key Laboratory of Tropical Medicinal Plant Chemistry of Ministry of Education, Hainan Normal University, Haikou, P. R. China;
3. State Key Laboratory Cultivation Base for the Chemistry and Molecular Engineering of Medicinal Resources of Ministry of Science and Technology, Guangxi Normal University, Guilin, P. R. China