FIELD: chemistry.
SUBSTANCE: invention relates to compounds of formula (I), having antibacterial properties, a method for synthesis thereof, use thereof and a pharmaceutical composition based on said compounds. In general formula (I) 
R1 is a (CH2)n-NH2 or (CH2)n-NHR radical, where R is (C1-C6)alkyl and n equals 1 or 2; R2 is a hydrogen atom; R3 and R4 together form a nitrogen-containing aromatic 5-member heterocycle with 1, 2 or 3 nitrogen atoms, possibly substituted with one or more R' groups, where R' is selected from a group consisting of a hydrogen atom and alkyl radicals with 1-6 carbon atoms.
EFFECT: improved method.
13 cl, 4 ex
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