IACS-4619 (compound 4) is a highly selective 2-aminopyrimidine-based MTH1 ( MutT homolog 1 ) inhibitor ( IC 50 =0.2 nM). IACS-4619 inhibits MTH1 by blocking its hydrolysis of oxidized purine nucleotides such as 8-oxo-dGTP , thereby preventing MTH1 from inhibiting the incorporation of oxidized nucleotides into DNA. IACS-4619 significantly inhibits endogenous MTH1 activity in MTH1-overexpressing U2OS cells, but without antiproliferative or cytotoxic effects on various human cancer and normal cell lines. IACS-4619 can be used in oncology research related to the MTH1 target.
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