1. Department of Chemistry, Korea University, Seoul 136-701, Korea
2. Department of Applied Chemistry, Kyung Hee University, Yongin 446-701, Korea
3. Gangneung Center, Korea Basic Science Institute, Gangneung 210-702, Korea
4. State Key Laboratory
of Fine
Chemicals, Dalian University of Technology, Dalian 116024, P. R. China
5. The School of East-West Medical
Science, Kyung Hee University, Yongin 446-701,
Korea