Cephalosporin derivatives which have an excellent antibacterial action particularly against bacteria belonging to genus Pseudomonas or Serratia and are represented by the formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and n are as defined in the specification, and salts thereof; a process for preparing the same; and an antibacterial preparation containing the same as an active ingredient are disclosed.
头孢菌素衍
生物具有优良的抗菌作用,特别对属于假单胞菌属或沙雷氏菌属的细菌具有显著作用,其
化学结构如下:##STR1## 其中R.sub.1、R.sub.2、R.sub.3、R.sub.4、R.sub.5和n如规范中所定义,以及其盐;公开了制备该化合物的方法;以及含有其作为活性成分的抗菌制剂。