High affinity, cell-permeable inhibitor of casein kinase 2 (CK2) (K i = 40 nM; IC 50 = 0.13 μ M). Displays no activity at CK1 at concentrations up to 200 μ M. Also inhibits Pim kinase (IC 50 values are 0.097, 0.148 and 1.6 μ M for Pim-3, Pim-1 and Pim-2 kinase respectively), and protein kinase D1 (IC 50 = 0.18 μ M). Derivative of TBB (4,5,6,7-Tetrabromobenzotriazole).
