Cephalosporin hydroxamic acids

摘要: SHIONOGI SEIYAKU KABUSHIKI KAISHA CEPHALOSPORIN HYDROXAMIC ACIDS Inventors: Wataru Nagata, Yasuhiro Nishitani and Tsutomiu Aoki. - ABSTRACT -An antibacterial cephalosporin hydroxamic acid derivative represented by the following formula (I), processes for its preparation, compositions containing same as an active ingredient, a method killing bacteria contacting with said compound. (I) (wherein, R is acyl; R1 hydrogen or methoxy; R2 alkylene; R3 aliphatic group; R4 amino-protecting R5 hydrogen, light metal atom carboxy-protecting X oxygen, sulfur, sulfinyl).