WM-1119 induces cell cycle exit and cellular senescence without causing DNA damage. WM-1119 is 1,100-fold and 250-fold more active against KAT6A than against KAT5 or KAT7, respectively, and so shows greater specificity for KAT6A than does WM-8014. The testing of WM-1119 at 1 μM and 10 μM against a pharmacological panel of 159 diverse biological targets reveal no affinity. Treatment of MEFs with WM-1119 results in cell cycle arrest in G1 and a senescence phenotype similar to that seen upon treatment with WM-8014. Notably, the activity of WM-1119 in this cell-based assay is an order of magnitude greater than WM-8014 and WM-1119 is able to induce cell cycle arrest at 1 μM. Treatment with WM-8014 or WM-1119 inhibits the proliferation of the EMRK1184 lymphoma cells in vitro, WM-1119 (IC₅₀=0.25 μM) is ninefold more active than WM-8014 (IC₅₀=2.3 μM), as expected on the basis of reduced protein binding.