FIELD: pharmacology.
SUBSTANCE: described are enantiomer-free compounds with a general formula of (1) 
wherein the R1, R2, R3, R4 and X- residue may have as specified in the invention formula, intermediary compounds, a pharmaceutical composition as well as their application in the capacity of medications intended for respiratory tract diseases treatment.
EFFECT: new enantiomer-free b-agonists, their preparation method and application in the capacity of medications.
11 cl, 5 dwg, 3 tbl, 37 ex
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