1. Department of Pharmacology (Y.K.K., Y.K., K.M., K.N., S.M., T.I.), School of Pharmaceutical Sciences, University of Shizuoka, Shizuoka City 422–8526, Japan
2. Department of Applied Chemistry in Bioscience (M.Y., D.H., Y.S.), Graduate School of Agricultural Science, Faculty of Agriculture, Kobe University, Kobe 650–0017, Japan
3. Department of Chemistry (F.S.), Graduate School of Science, Chiba University, Chiba 260–8670, Japan