1. Department of Chemistry, Faculty of Science; Ehime University; Matsuyama 790-8577 Japan
2. SSCI Laboratories, Faculty of Pharmacy; Musashino University, Shinmachi 1-1-20, Nishitokyo-Shi; Tokyo 202-0023 Japan
3. Product Development Department, Consumer hhc Business Division; Eisai Company, Ltd., Koishikawa 5-5-5, Bunkyo-ku; Tokyo 112-8088 Japan