1. API Process Research Department, API Business Division, Towa Pharmaceutical Co., Ltd., Amagasaki Research Incubation Center 3F, 7-1-3 Doi-cho, Amagasaki, Hyogo 660-0083, Japan
2. Production Department, Himeji Plant, Daichikasei Co., Ltd., 336-2 Jihoji, Himeji, Hyogo 671-2244, Japan
3. Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
4. RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan