| 摘要 |
The invention relates to novel quinolone- and naphthyridonecarboxylic acid derivatives of the formula (I) <IMAGE> in which R1, R2, R3, R4 and A have the meaning given in the description and which carry an alkyl or a substituted alkyl radical in the 5-position, a process for their preparation and antibacterial agents and food additives containing them. |
