1. Natural Products Research Institute, College of Pharmacy, Seoul National University, Seoul 08826, Republic of Korea
2. College of Pharmacy, Chonnam National University, Gwangju 61186, Republic of Korea
3. Department of Chemistry, Dongguk University, Seoul 04620, Republic of Korea
4. Department of Agricultural Biotechnology, College of Agriculture & Life Sciences, Seoul National University, Seoul 08826, Republic of Korea