Affiliation: | Institute of Microbial Chemistry Kamiosaki, Shinagawa-ku, Tokyo 141, Japan;Institute of Bioorganic Chemistry Ida, Nakahara-ku, Kawasaki 211, Japan;Pharmaceutical Division, Nippon Kayaku Co. Ltd., Shimo, Kita-ku, Tokyo 115, Japan;Faculty of Pharmaceutical Sciences, University of Tokyo, Bunkyo-ku, Tokyo 113, Japan |