1. ; Department of Agricultural Chemistry; Kyoto University; Sakyo-ku, Kyoto 6O6 Japan
2. ; Department of Agricultural Chemistry, Faculty of Agriculture; Kyoto University; Kitashirakawa Sakyo-ku, Kyoto 606 Japan
3. ; Laboratory of Microbial Science, Institute for Fundamental Research; Suntory Ltd.; Mishimagun, Osaka 618 Japan