1. College of Pharmacy, Sookmyung Women's University, Seoul 140-742, Republic of Korea
2. Department of Medical and Pharmaceutical Science, College of Science, Sookmyung Women's University, Seoul 140-742, Republic of Korea
3. Natural Medicine Research Center, Korea Research Institute of Bioscience & Biotechnology, Cheongwon 363-883, Republic of Korea
4. College of Pharmacy, Dongguk University-Seoul, Goyang 410-820, Republic of Korea
5. International Biological Material Research Center, Korea Research Institute of Bioscience & Biotechnology, Daejeon 305-806, Republic of Korea