1. Natural
Product Research Institute, College of Pharmacy, Seoul National University, Sillim-dong, Gwanak-gu, Seoul 151-742, Korea
2. Department
of Biochemistry and Molecular Biology, School of Medicine, Shenzhen University, Shenzhen 518060, China
3. Natural
Constituents Research Center, Korea Institute of Science and Technology (KIST), Gangneung 25451, Korea
4. National
Center for Inter-University Research Facilities (NCIRF), Seoul National University, Sillim-dong, Gwanak-gu, Seoul 151-742, Korea
5. Department
of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts 02115, United States