1. Natural Products Laboratory, School of Pharmacy, Sungkyunkwan University, Jangan-ku, Suwon, Gyeonggi-do, Republic of Korea
2. College of Pharmacy, Gachon University, Yeonsu-gu, Incheon, Republic of Korea
3. Korea Research Institute of Chemical Technology, Teajeon, Republic of Korea
4. Dong-A Pharm Institute, Kiheung, Youngin, Republic of Korea