FIELD: chemistry.
SUBSTANCE: invention relates to organic chemistry, particularly to a compound of formula (I) or an isomer thereof or a pharmaceutically acceptable salt thereof, where R1 and R2 each independently represents H or F; R3 is H or methyl; and either a) R4 is H, and R5 is F; or b) R4 is F, and R5 is H. Invention also relates to a method for preventing or treating cancer, a pharmaceutical composition and a combination based on a compound of formula (I).
.
EFFECT: novel heterocyclic compound useful in the treatment of cancer is obtained.
14 cl, 12 dwg, 2 tbl, 15 ex
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