Novel quinolinecarboxylic acid derivatives of the formula: ##STR1## wherein Z is ##STR2## in which R.sup.1 is hydrogen atom, a halogen atom, hydroxy or a lower alkyloxy; R.sup.2 is a halogen atom, hydroxy or a lower alkyloxy; R.sup.3 is a lower alkyl; and R.sup.4 is hydroxy or a di(lower alkyl)amino, and a pharmaceutically acceptable salt thereof, which have excellent antibacterial activities and are useful as an antibacterial agent, a pharmaceutical composition containing the same, and process for preparing the same.
化合物的结构式为:##STR1## 其中Z为##STR2##其中R1为氢原子、卤素原子、羟基或低碳基氧基;R2为卤素原子、羟基或低碳基氧基;R3为低碳基;R4为羟基或二(低碳基)
氨基,以及其药学上可接受的盐,具有出色的抗菌活性,可用作抗菌剂,含有该化合物的制药组合物,以及其制备方法。