1. Natural Products
Laboratory, School of Pharmacy, Sungkyunkwan University, Suwon 440-746, Republic of Korea
2. Graduate School
of East-West Medical Science, Kyung Hee University, Yongin 446-701, Republic of Korea
3. Gachon Institute
of Pharmaceutical Science, Gachon University, Incheon 406-799, Republic of Korea
4. College of Pharmacy, Gachon University, Incheon 406-799, Republic of Korea