Quinolonecarboxylic acid derivatives of the following formula, ##STR1## wherein R is hydrogen atom or lower alkyl group, Alk is lower alkylene group and X is hydrogen atom or halogen atom; the hydrates and pharmaceutically acceptable salts thereof are useful as antibacterial agent.
下列公式的喹诺酸衍
生物,其中R为氢原子或较低的烷基,Alk为较低的烷基烷基,X为氢原子或卤素原子;其
水合物和药学上可接受的盐可用作抗菌剂。##STR1##