1. Planning & Development Department/Food, Liquor & Food Division, 6-1-1 Ohtemachi, Chiyoda-ku, Tokyo 100, Japan
2. Tokyo Research Laboratories, Kyowa Hakko Kogyo Co., Ltd., 3-6-6 Asahi-machi, Machida-shi, Tokyo 194, Japan
3. Pharmaceutical Research Laboratories, Kyowa Hakko Kogyo Co., Ltd., 1188 Shimotogari, Nagaizumi-cho, Sunto-gun, Shizuoka-ken, 411, Japan
4. Fine Chemicals/Biochemicals Dept., Medicals Research and Development Center, Kyowa Hakko Kogyo Co., Ltd., 6-1-1 Ohtemachi, Chiyoda-ku, Tokyo 100, Japan