1. Department of Food Science and Technology, College of Horticulture, Minami-Kyushu University, Takanabe, Miyazaki 884, Japan
2. Laboratory of Floriculture, College of Horticulture, Minami-Kyushu University, Takanabe, Miyazaki 884, Japan
3. Chemical Laboratory, Meiji-gakuin University, Totsuka-ku, Yokohama 224, Japan
4. Institute of Medicinal Chemistry, Hoshi University, Shinagawa-ku, Tokyo 142, Japan
5. Department of Food Science and Technology, Faculty of Agriculture, Kyushu University, Fukuoka 812, Japan