FIELD: organic chemistry. SUBSTANCE: product: quinoline carboxylic acid of the formula (I) 
where radicals R1-R6 have the corresponding meanings. Synthesis is carried out by interaction of quinoline derivative of the formula (II) 
where R have the corresponding meanings with piperazine derivatives of the formula (III) 
. Synthesized compounds show antibacterial activity. EFFECT: improved method of synthesis. 51 cl
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