compound of the formula:
in which
R1 and R2 are each hydrogen, halogen, lower alkoxy or halo(lower)alkyl,
R3 is aryl or ar(lower)alkyl, both of which may have one or more suitable substituent(s), or heterocyclic(lower)alkyl,
R4 is carboxy or protected carboxy,
A is oxygen or sulfur atom,
Y is carbonyl, thiocarbonyl or sulfonyl and
Z is lower alkylene,
and pharmaceutically acceptable salts thereof, processes for their preparation and pharmaceutical compositions comprising them in admixture with pharmaceutically acceptable carriers.
式的化合物:
其中
R1 和 R2 分别为
氢、卤素、低级烷
氧基或卤代(低级)烷基、
R3 是芳基或芳基(低级)烷基,两者均可带有一个或多个合适的取代基,或杂环(低级)烷基、
R4 是羧基或受保护的羧基、
A 是
氧原子或
硫原子
Y 是羰基、
硫代羰基或磺酰基,以及
Z 是低级亚烷基、
及其药学上可接受的盐、制备方法以及由它们与药学上可接受的载体混合而成的药物组合物。