1. College of Pharmacy and Institute of Drug Research and Development; Chungnam National University; Daejeon 34134 Korea
2. GeneChem Inc.; Daejeon 305-343 Korea
3. Korea Research Institute of Bioscience and Biotechnology; Daejeon 305-806 Korea
4. Genotech Inc.; Daejeon 305-343 Korea
5. College of Pharmacy; Korea University; Sejong 30019 Korea
6. College of Pharmacy; Yonsei University; Incheon 406-840 Korea