FIELD: chemistry.
SUBSTANCE: invention relates to organic chemistry, specifically a heterocyclic compound of formula (I) or a pharmaceutically acceptable salt thereof. Invention also relates to a pharmaceutical composition based on a compound of formula (I) or a pharmaceutically acceptable salt thereof, use thereof and a method of treating cancer. 
.
EFFECT: technical result: obtaining a novel compound of formula (I) and pharmaceutically acceptable salts thereof, having inhibitory activity with respect to activating mutated forms of EGFR and useful in the treatment of cancer.
16 cl, 10 tbl, 12 dwg, 7 ex
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