Penicillanic acid derivatives which have an excellent antibacterial action particularly against bacteria belonging to family Pseudomonas aeruginosa and are represented by the formula ##STR1## wherein R.sub.1, R.sub.2, and R.sub.3 and n are as defined above, and salts thereof; and a process for preparing the same are disclosed.
揭示了具有优秀抗菌作用的
青霉素酸衍
生物,特别针对属于假单胞菌科细菌的家族,其
化学式为##STR1## 其中R.sub.1、R.sub.2和R.sub.3以及n如上定义,并其盐;以及制备这些衍
生物的方法。