BAY-707 is an inhibitor of the human 7,8-dihydro-8-oxoguaninetriphosphatase MTH1 (NUDT1), which hydrolyzes oxidized purine nucleoside triphosphates that might otherwise be incorporated into DNA/RNA and contribute to DNA damage. BAY-707 was shown to be a substrate-competitive, selective MTH1 inhibitor with an IC50 value of 2.3 nM.