A cephalosporin derivative represented by the formula: ##STR1## wherein R.sub.1 represents a lower alkyl group, and A is selected from: a group of the following formula: ##STR2## where R.sub.2 and R.sub.3 are the same or different lower alkyl group, R.sub.4 represents a substituted lower alkyl or amino group; a group which may be substituted and which is represented by the following formula: ##STR3## where R.sub.5 represents a lower alkyl group; or a group of the following formula: ##STR4## where R.sub.5 is as defined above, R.sub.6 represents a hydroxyl lower alkyl or carboxyl group, or its pharmacologically acceptable salt, and a process for preparing the same, as well as an antibacterial agent containing the same.
一种
头孢菌素衍
生物,其结构式如下:##STR1## 其中R1代表低级烷基,A选自以下组:一个具有以下公式的组:##STR2## 其中R2和R3相同或不同,均为低级烷基,R4代表取代的低级烷基或
氨基;一个可被取代且由以下公式表示的组:##STR3## 其中R5代表低级烷基;或一个具有以下公式的组:##STR4## 其中R5如上所定义,R6代表羟基低级烷基或羧基,或其药学上可接受的盐,以及制备该衍
生物的方法,以及含有该衍
生物的抗菌剂。