1. Laboratory of Medicinal Chemistry; School of Pharmacy; Kitasato University; 5-9-1, Shirokane, Minato-ku 108-8641 Tokyo Japan
2. Medicinal Research Laboratories; School of Pharmacy; Kitasato University; 5-9-1, Shirokane, Minato-ku 108-8641 Tokyo Japan
3. Synthetic Organic Chemistry Laboratory; RIKEN; 2-1, Hirosawa, Wako-shi 351-0198 Saitama Japan
4. Laboratory of Hygienic Chemistry; School of Pharmacy; Kitasato University; 5-9-1, Shirokane, Minato-ku 108-8641 Tokyo Japan