1. Tobacco Science Research Center, R&D Group, Japan Tobacco Inc., 6-2 Umegaoka, Aoba, Yokohama, Kanagawa 227-8512, Japan
2. Scientific Product Assessment Center, R&D Group, Japan Tobacco Inc., 6-2 Umegaoka, Aoba, Yokohama, Kanagawa 227-8512, Japan
3. Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan