QUINOLONE- AND NAPHTHYRIDONE CARBOXYLIC ACID DERIVATIVES, PROCESS FOR THEIR PRODUCTION, ANTIBACTERIAL COMPOSITIONS AND FEED ADDITIVES CONTAINING THEM

摘要

An antibacterially active quinolone or naphthyridonecarboxylic acid derivative of the formula (see formula I) in which R1 stands for various organic radical, R2 stands for hydrogen, alkyl having 1 to 4 carbon atoms or (5-methyl-2-oxo-1,3-dioxol-4-yl)-methyl, R3 stands for hydrogen or amino, R4 stands for a radical of the formula (see formula II) and wherein A stands for N or C-R5, R5 stands for hydrogen, halogen methyl, cyano or nitro or else together with R1 can form a bridge of the structure (see formula III) 2/2 or a pharmaceutically utilizable hydrate, acid addition salt, alkali metal salt, alkaline earth metal salt, silver salt or guanidiniunu salt of the carboxylic acid when R2 is hydrogen.