1. AminoScience Laboratories, Ajinomoto Co., Inc., 1-1, Suzuki-cho, Kawasaki-ku, Kawasaki, 210-8681 Japan, Department of Chemistry and Research Center for Materials Science, Nagoya University, Chikusa, Nagoya, 464-8602 Japan, and Graduate School of Science and Engineering, Tokyo Institute of Technology and CREST, Japan Science and Technology Cooperation (JST), 2-12-1 O-okayama, Meguro-ku, Tokyo, 152-8552 Japan