T025 is as an orally available and potent inhibitor of Cdc2‐like kinases (CLKs) with an IC50s of 0.93 nM, 1 nM, 14 nM, 1.5 nM for CLK1, CLK2, CLK3, DYRK1B respectively. It exhibits anti‐tumor efficacy and can be used in MYC‐driven cancer research.