FIELD: chemistry.
SUBSTANCE: present invention relates to a pyrazolo[3,4-d]pyrimidine compound of formula (I), use thereof for preparing an anticancer drug and a pharmaceutical composition. In formula (I): Ar is 
R is H, CF3, (CH3)2NCH2 or CH3 and the linker is 
and said compound also includes compound 25 and compound 26.
EFFECT: disclosed compounds have an inhibitory effect on FGFR to block the FGF/FGFR signaling pathway and can be used to treat cancer associated with FGFR.
5 cl, 4 dwg, 2 tbl, 44 ex
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