1. Graduate School
of Pharmaceutical Sciences, University of Tokyo, 7-3-1, Hongo,
Bunkyo-ku, Tokyo 113-0033, Japan
2. Japan Science and Technology Agency (JST), 4-1-8 Honcho Kawaguchi, Saitama 332-0012, Japan
3. Department of Chemistry, University of Minnesota, 312 Smith
Hall, 207 Pleasant St. SE, Minneapolis, Minnesota 55455-0431, United States
4. Department of Medicinal Chemistry, University of Minnesota, 717 Delaware Street, SE, Minneapolis, Minnesota 55414, United States