1. Department of Chemistry, Faculty of Science, Tokyo University of Science, Kagurazaka, Shinjuku, Tokyo 162‐8601 (Japan), Fax: (+81) 3‐5261‐4631
2. Present Address: Molecular Engineering Institute (MEI), Kinki University, 11‐6 Kayanomori, Iizuka, Fukuoka 820‐8555 (Japan)
3. Graduate School of Engineering, Osaka University, Suita, Osaka 565‐0871 (Japan), Fax: (+81) 6‐6879‐7394
4. Faculty of Pharmaceutical Science at Kagawa Campus, Tokushima Bunri University, 1314‐1 Shido, Sanuki, Kagawa 769‐2193 (Japan)
5. Present Address: Chemical Analysis Center, Chiba University, 1‐33 Yayoi‐cho, Inage, Chiba 263‐8522 (Japan)