1. Medicinal Chemistry Research Center, Korea Research Institute of Chemical Technology, 141 Gajeong-ro, Daejeon
305-600, Korea
2. Department
of Chemistry, Korea University, 145 Anam-ro,
Seoul 105-600, Korea
3. Graduate
School of New Drug Discovery and Development, Chungnam National University, 99 Daehak-ro, Daejeon 305-764,
Korea