1. Kobe Pharmaceutical University, Motoyama-kita, Higashinada-ku, Kobe 658-8558, Japan; Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto-fu 611-0011, Japan; and M. Theiss Hard- and Software, Dr.-Bernhard-Klein-Strasse 110, D-52078 Aachen, Germany