1. Department of Chemistry, School of Science, Kwansei-Gakuin University, Uegahara, Nishinomiya 662-8501, Japan, Department of Environment Information and Bio-production Engineering, Faculty of Agriculture, Kobe University, Rokkodai, Nada-ku, Kobe 657-8501, Japan, and Department of Applied Biological Sciences, Faculty of Agriculture, Saga University, Honjo, Saga 840-8502, Japan