Institution: | 1. Department of Chemistry, Faculty of Science and Technology, Keio University, 3‐14‐1, Hiyoshi, Kohoku‐ku, Yokohama, 223‐8522 (Japan);2. Chemical Resources Laboratory, Tokyo Institute of Technology, 4259, Nagatsuta, Midori‐ku, Yokohama, 226‐8503 (Japan), Fax: (+81)?459‐245‐260 |