Quinolonecarboxylic acid derivatives of the following formula, ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are each independently hydrogen atom or lower alkyl group; the hydrates or the pharmaceutically acceptable acid addition or alkali salts thereof are useful as an antibacterial agent.
以下式的喹诺
酮羧酸衍
生物,其中R.sup.1、R.sup.2、R.sup.3和R.sup.4分别独立表示氢原子或较低的烷基基团;其
水合物或药用可接受的酸盐或碱盐可用作抗菌剂。