FIELD: chemistry.
SUBSTANCE: invention relates to the field of organic chemistry, specifically to a heterocyclic compound of formula (I) or a pharmaceutically acceptable salt thereof, where R1 is selected from the group consisting of cyano, halogen and methyl; R2 is selected from the group consisting of hydrogen and halogen; R3 is selected from the group consisting of halogen and methyl; R4 is selected from the group consisting of hydrogen and halogen; R5 and R6 are independently selected from the group consisting of hydrogen and C1-C6-alkyl; R7 and R8 are independently selected from the group consisting of hydrogen and C1-C4-alkyl; R9 is selected from the group consisting of C1-C6-alkyl and C1-C6-alkoxy; and X is selected from CH2 and O. Invention also relates to a pharmaceutical composition based on a compound of formula (I) and use thereof. 
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EFFECT: technical result: obtaining novel imidazopyridine derivatives, useful in the treatment of a condition associated with P2X2/3 activity.
24 cl, 2 dwg, 2 tbl, 49 ex
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