1. Contribution from the Faculty of Pharmaceutical Sciences, Toyama Medical and Pharmaceutical University, Sugitani 2630, Toyama 930-0194, Japan, Kagami Memorial Laboratory for Materials Science and Technology, Waseda University, 2-8-26, Nishi-Waseda, Shinjuku-ku, Tokyo 169-0051, Japan, and Rigaku Corporation, 3-9-12 Matsubara-cho, Akishima, Tokyo 196-8666, Japan