1. Departments of Applied Chemistry and of Information and Computer Science, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan, Kanagawa Academy of Science and Technology (KAST), KSP West 614, 3-2-1 Sakado, Takatsu-ku, Kawasaki 213-0012, Japan, and Core Research for Evolutional Science and Technology (CREST), JST Agency, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan