1. Department of Chemistry; Faculty of Science and Technology; Keio University; 3-14-1 Hiyoshi, Kohoku-ku Yokohama 223-8522 Japan
2. Department of Chemistry; Graduate school of Science; Osaka University; 1-1 Machikaneyama, Toyonaka Osaka 560-0043 Japan
3. Bernhard Nocht Institute for Tropical Medicine; Bernhard-Nocht-Str.74 Hamburg 20359 Germany
4. Department of Chemistry and Biomolecular Science; Faculty of Engineering; Gifu University, Yanagido; Gifu 501-1193 Japan