FIELD: organic chemistry, antibacterial agents.
SUBSTANCE: invention relates to an agent used against acid-resistant microorganisms containing derivative of pyridone carboxylic acid as an active component, its pharmaceutically acceptable salt or its hydrate that elicits high antibacterial activity against Mycobacterium tuberculosis and atypical acid-resistant microorganisms. Invention describes agent used against acid-resistant microorganisms containing compound represented by the following formula (I) 
its salt or its hydrate as an active component wherein R1 represents cyclic alkyl group comprising 3-6 carbon atoms that can comprise substitute(s) chosen from halogen atom; R2 represents hydrogen atom; R3 represents hydrogen atom; A1 represents incomplete structure represented by the formula (2): 
wherein X2 represents halogen atom, alkyl group comprising 1-6 carbon atoms or alkoxy-group comprising 1-6 carbon atoms; A1, A2 and A3 form incomplete structure of the formula: 
in common with carbon atoms combined with them; X1 represents halogen atom; Y represents hydrogen atom; Z represents phenylpiperazine substitute. Invention provides synthesis of pyridone carboxylic acid eliciting high antibacterial activity against Mycobacterium tuberculosis and atypical acid-resistant microorganisms in combination with good pharmacokinetics indices and safety.
EFFECT: valuable biological property of agent.
10 cl, 9 tbl, 10 ex
