1. Interdisciplinary Program of Biological Functional Molecules, College of IntegrationScience, Yanbian University, Park Road 977, Yanji City, Jilin Province, 133002, PR China
2. Department of Chemistry, Yanbian University, Park Road 977, Yanji City, Jilin Province, 133002, PR China
3. Department of Environmental Science, Zhejiang University, Hangzhou, 310058, PR China
4. Natural Product Research Institute, College of Pharmacy, Seoul National University, Seoul 08826, Korea
5. Department of Chemistry, Sungkyunkwan University, Suwon, 440-746, Republic of Korea