Bcl-2-IN-5 is a BCL-2 inhibitor with IC 50 s of 0.12 nM, 0.14 nM and 0.22 nM for Bcl-2 wild type, Bcl-2 D103Y and Bcl-2 G101V , respectively. Bcl-2-IN-5 inhibits the cell growth with IC 50 values of 0.2 nM and 0.44 nM for Bcl 2-G101V knock-in RS4; 11 and RS4; 11 cells, respectively (WO2021208963A1; Example 155).