FIELD: chemistry.
SUBSTANCE: invention relates to a novel compound of formula I and its pharmaceutically acceptable salts. Said compounds possess antibacterial activity and can be used in treatment of bacterial infections. In formula I 
, the values of the radicals R2, R4, L are selected from the following values:
.
EFFECT: compounds have improved activity compared with the closest analogues when administered orally while maintaining gram-negative activity.
8 cl, 4 tbl, 5 ex
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