FIELD: medicine.
SUBSTANCE: there are described compounds of formula 
in a free form or in the form of salt where R1 and R2 have values specified in the description of the application which are used for treating inflammatory conditions, first of all inflammatory or obstructive respiratory tract diseases. Besides the application describes the pharmaceutical compositions containing said compounds, and methods for preparing said compounds.
EFFECT: compounds exhibits improved efficiency.
5 cl, 8 ex
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