PROTAC CDK9/CycT1 Degrader-1 (compounds 10) is a potent inhibitor of CDK9. PROTAC CDK9/CycT1 Degrader-1 can be used as a PROTAC target protein ligand for PROTAC synthesis. PROTAC CDK9/CycT1 Degrader-1 shows strong anti-proliferative activity in solid tumors.