– SJ44236 is a BET PROTAC degrader capable of degrading BRD2 (DC50 = 0.127 nM), BRD3, and BRD4. It shows cytotoxicity in MV4-11 and HD-MB03 cells with IC50 values of 0.12 nM and 0.92 nM, respectively. The compound downregulates c-Myc expression and upregulates p53 expression. In mice, SJ44236 demonstrates good oral bioavailability (45%). [Pink: ligand for target protein JQ-1 carboxylic acid; Black: linker; Blue: ligand for E3 ligaseCereblonE3ligaseLigand 54]