An antibacterially active quinolone or naphthyridonecarboxylic acid derivative of the formula ##STR1## in which R.sup.1 stands for various organic radical, R.sup.2 stands for hydrogen, alkyl having 1 to 4 carbon atoms or (5-methyl-2-oxo-1,3-dioxol-4-yl)methyl, R.sup.3 stands for hydrogen or amino, R.sup.4 stands for a radical of the formula ##STR2## A stands for N or C--R.sup.5, wherein R.sup.5 stands for hydrogen, halogen methyl, cyano or nitro or else together with R.sup.1 can form a bridge of the structure ##STR3## or a pharmaceutically utilizable hydrate, acid addition salt, alkali metal salt, alkaline earth metal salt, silver salt or guanidinium salt of the carboxylic acid when R.sup.2 is hydrogen.
一种具有抗菌活性的
喹诺酮或
萘啶
酮羧酸衍
生物的
化学式为##STR1##其中R.sup.1代表各种有机基团,R.sup.2代表氢,1至4个碳原子的烷基或(5-甲基-2-氧代-1,3-二氧杂环戊-4-基)甲基,R.sup.3代表氢或
氨基,R.sup.4代表式##STR2##A代表N或C--R.sup.5,其中R.sup.5代表氢,卤素甲基,
氰基或硝基,或者与R.sup.1一起形成结构的桥梁##STR3##或药物可利用的
羧酸的
水合物,酸加成盐,碱
金属盐,碱土
金属盐,
银盐或羟基
胍盐,当R.sup.2为氢时。