1. Department of Life Science and Biochemical Engineering, Sun Moon University, Asan, South Chungcheong�31460, Republic of Korea
2. Anticancer Agent Research Center, Korea Research Institute of Bioscience and Biotechnology, Cheongju, North Chungcheong 28116, Republic of Korea
3. Natural Medicine Research Center, Korea Research Institute of Bioscience and Biotechnology, Cheongju, North Chungcheong 28116, Republic of Korea