1. Pharmaceutical Research Laboratories, Nippon Kayaku Co., Ltd., Tokyo 115‑0042, Japan
2. China‑Japan Research Institute of Medical and Pharmaceutical Sciences, Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang, Liaoning 110016, P.R.�China
3. Department of Chemistry and Life Science, School of Advanced Engineering, Kogakuin University, Tokyo 192‑0015, Japan