FIELD: organic chemistry and technology, antibiotics. SUBSTANCE: product: compound of the general formula (I) 
where R means the group a) -A-COOH where A means -(CH=CH)-, -OCH2- or -SCH2-, the group b) -(CH2)nSO2NHCN or heteroaryl and its pharmaceutically acceptable salts. Compounds were synthesized by interaction of compound (II) 
where R - as indicated above with compound of the general formula (III) 
where R' and R" - protective groups and Z - desplitting group. Compounds of the formula (I) show antibacterial activity and were used as active component of the pharmaceutical composition. EFFECT: improved method of synthesis. 5 cl, 2 tbl
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