1. Natural Products Research Institute, College of Pharmacy, Seoul National University, San 56-1, Sillim, Gwanak, Seoul 151-742, Korea
2. Department of Agricultural Biotechnology, College of Agriculture and Life Science, Seoul National University, San 56-1, Sillim, Gwanak, Seoul 151-921, Korea
3. Natural History Museum, Ehwa Womans University, 52 Ewhayeodae-gil, Seodaemun, Seoul 03760, Korea