Min Hee Lee a, Thang Van Giap b, Sang Hoon Kim a, Young Hoon Lee a, Chulhun Kang *b and Jong Seung Kim *a
aDepartment of Chemistry, Korea University, Seoul 136-701, Korea.
bThe School of East-West Medical Science, Kyung Hee University, Yongin 446-701, Korea.
*To whom correspondence may be addressed.