Cephalosporin derivatives represented by general formula (I) [wherein R1 represents a lower alkyl group, A represents (II) (wherein R2 and R3 may be the same or different and each represents a lower alkyl group, and R4 represents a substituted lower alkyl group or an amino group), an optionally substituted group represented by formulae (III), (IV), (V) (wherein Rs represents a lower alkyl group] or a group of formula (VI) (wherein R5 is the same as defined above and R6 represents a hydroxy- lower alkyl group or a carboxyl group)] and pharmaceutically acceptable salts thereof, processes for their preparation, and antibacterial agents containing them.
由通式(I)代表的
头孢菌素衍
生物[其中 R1 代表低级烷基,A 代表(II)(其中 R2 和 R3 可以相同或不同且各自代表低级烷基,R4 代表取代的低级烷基或
氨基),由式(III)、(IV)、(V)(其中 Rs 代表低级烷基)]或式(VI)(其中 R5 与上述定义相同,R6 代表羟基-低级烷基或羧基)]代表的任选取代基团及其药学上可接受的盐、它们的制备工艺以及含有它们的抗菌剂。