1. Faculty of Advanced Life Science; Hokkaido University, N21W11, Kita-ku; Sapporo 001-0021 Japan
2. Medicinal Chemistry Pharmaceuticals, Co., Ltd. N9W15, Chuo-ku; Sapporo 060-0009 Japan
3. Institute of Physiological Chemistry; Faculty of Veterinary Medicine; Ludwig-Maximilians-University Munich; Veterinärstr. 13 80539 München Germany