BT-O2C is a highly selective p300 PROTAC degrader. BT-O2C can significantly degrade the level of p300 in HAP1 cells. BT-O2C has significant cytotoxicity in CIC:DUX4 sarcoma (CDS) cell lines (IC50 ranges from 152 to 221 nM) and significantly reduces the expression of CDS target genes (ETV1, ETV4, ETV5). BT-O2C can be used for research on cancer. (Pink: p300 Ligand (HY-174868), Blue: CRBN Ligand (HY-W023573), Black: Linker, CRBN Ligand+Linker (HY-174869))[1].