1. Department
of Biosystems and Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul 136-713, Korea
2. Natural
Products Research Institute, College of Pharmacy, Seoul National University, Seoul 151-742, Korea
3. College
of Pharmacy, Chungbuk National University, Cheongju 361-763, Korea
4. Korea Forest Research Institute, Seoul 130-712, Korea