1. Laboratory
of Medicinal Chemistry, Research Institute of Pharmaceutical Sciences,
College of Pharmacy, Seoul National University, Seoul 151-742, Korea
2. College of Pharmacy, Division of Life and Pharmaceutical Sciences,
and National Core Research Center for Cell Signaling and Drug Discovery
Research, Ewha Womans University, Seoul
120-750, Korea
3. Laboratory
of Cancer Biology and Genetics, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892, United States
4. Grunenthal Innovation, Grunenthal GmbH, D-52078 Aachen, Germany