PROTAC CB1R Degrader-1 is a potent and selective CB1R PROTAC degrader that exploits the ubiquitin-proteasome system (UPS) achieving a DC50 of 3.37 µM in MCF-7 cells and showing no impact on CB2R. PROTAC CB1R Degrader-1 reduces CB1R-associated downstream signaling (p-AKT, p-ERK, BCL2, and MCM5), thereby inhibiting breast cancer cell proliferation and inducing apoptosis. PROTAC CB1R Degrader-1 can be used for breast cancer research. (Blue: CRBN ligand (HY-41547), Black: linker (HY-178198), Pink: CB1R ligand (HY-134497))[1].