1. School of Life Sciences and Biotechnology, Korea University, Seoul 136-713, Republic of Korea
2. Natural Products Research Institute, Gyeonggi Institute of Science & Technology Promotion, Suwon 443-270, Republic of Korea
3. Korean Agricultural Culture Collection, National Academy of Agricultural Science, Suwon 441-707, Korea
4. College of Pharmacy, Chungbuk National University, Cheongju 361-763, Republic
of Korea
5. Korea Forest Research Institute, Seoul 130-712, Korea
6. College of Pharmacy, Kyung Hee University, Seoul 130-701, Korea