1. Laboratory of Medicinal Chemistry, School of PharmacyKitasato University Tokyo 108-8641 Japan
2. Medicinal Research Laboratories, School of PharmacyKitasato University Tokyo 108-8641 Japan
3. Department of Chemistry, Graduate School of ScienceKitasato University Kanagawa 252-0373 Japan
4. Department of Materials Chemistry, Faculty of EngineeringShinshu University Nagano 380-8553 Japan
5. Division of Liberal Arts Center for Promotion of Higher EducationKogakuin University Tokyo 192-0015 Japan