JET-209 is a potent CBP/p300 PROTAC degrader, with DC50 values of 0.05 nM and 0.2 nM for CBP and p300. JET-209 demonstrates remarkable anti-tumor activity against various acute leukemia cell lines and effectively inhibits tumor growth in xenograft tumor models. JET-209 can be used for the study of acute leukemia (Pink: CBP/p300 ligand ; Blue: CRBN ligand (HY-132248) ; Black: Linker; CBP/p300 ligand + Linker (HY-175621) ).