One hour inhibitor treatment (0.5 μM) of HEK-293T cultures at the end of a 4 hour 32PO4 incubation period results in nearly complete inhibition of the autophosphorylation of overexpressed Pim-1. Comparing to Inhibitor VI (Cat. No. 526524), Inhibitor V is less reactive towards DYRK1α (20% vs. 68% inhibition with respective inhibitor at 5 μM) and more potent in PC3 human prostate cancer cell killing (IC50 = 17 vs. 48 μM with respective inhibitor).