Novel quinolinecarboxylic acid derivatives of the formula: ##STR1## wherein Z is ##STR2## in which R.sup.1 and R.sup.2 are each hydrogen atom or a lower alkyl, R.sup.3 is hydrogen atom, hydroxy or a lower alkyl and R.sup.4 is hydrogen atom, hydroxy, amino, aminomethyl, a (lower alkyl)aminomethyl or a di(lower alkyl)aminomethyl, and a pharmaceutically acceptable salt thereof. The compounds have excellent antibacterial activities and are useful as an antibacterial agent.
公式为:##STR1## 其中 Z 是 ##STR2## 其中 R.sup.1 和 R.sup.2 分别是氢原子或较低的烷基,R.sup.3 是氢原子、羟基或较低的烷基,R.sup.4 是氢原子、羟基、
氨基、
氨甲基、(较低烷基)
氨基甲基或二(较低烷基)
氨基甲基,以及其药用可接受的盐。这些化合物具有出色的抗菌活性,并可用作抗菌剂。