FIELD: organic chemistry, pharmacy. SUBSTANCE: invention relates to novel compounds of the general formula (I) 
where R1 means OH, O-acyl; R2 means groups of the following formulas: (II) 
, (III) 
, (IV) 
, (V) 
, (VI) 
and (VII) 
. These compound show siderophorous activity and antibacterial activity additionally. Owing to these properties they can be used as an active substance in medicinal agents and, first of all, for elimination of resistance to antibiotics caused by insufficient penetration. EFFECT: new compounds indicated above, valuable medicinal properties. 23 cl, 7 tbl
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