1. Department of Medicinal Chemistry; School of Pharmacy; Tokyo University of Pharmacy and Life Sciences; 1432-1 Horinouchi, Hachioji Tokyo 192-0392 Japan
2. Department of Analytical Chemistry; School of Pharmacy; Tokyo University of Pharmacy and Life Sciences; Japan
3. Kokusan Chemical Co., Ltd.; 3-1-3 Nihonbashihoncho, Chuo-ku Tokyo 103-0023 Japan