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. Department of Biological
Science,
College of Life Science, Ehwa Womans University, 52, Ehwayeodae-gil, Seodaemun, Seoul 120-750, Korea