FIELD: organic chemistry. SUBSTANCE: invention relates to a method of synthesis of an antibacterial compound of the formula (I) 
or its salt that involves hydrogenolysis of a new compound of the formula (II) 
and if necessary an isolation of synthesized carboxylic acid as its salt. Invention proposes also a compound of the formula (II) used as an intermediate substance for synthesis of a compound of the formula (I). The use of compound of the formula (II) simplifies purification stage if it is necessary before the end synthesis stage carrying out. EFFECT: improved and simplified method. 9 cl, 6 ex
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