BI-D1870 is an ATP-competitive inhibitor of S6 ribosome for RSK1/2/3/4 with IC50 of 31 nM/24 nM/18 nM/15 nM, respectively; 10- to 100-fold selectivity for RSK than MST2, GSK-3, MARK3, CK1 and Aurora B. BI-D1870 also has a Kd value of 3.5 uM for BRD4.
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