1. Laboratory of Chemistry, Toyama Medical and Pharmaceutical University, Sugitani 2630, Toyama 930-01, Japan
2. Faculty of Pharmaceutical Sciences, Toyama Medical and Pharmaceutical University, Sugitani 2630, Toyama 930-01, Japan
3. Department of Advanced Chemical Technology, National Institute of Materials and Chemical Research, 1-1, Higashi, Tsukuba, Ibaraki 305, Japan