PROTAC Mcl1 degrader-1 (compound C3), a proteolysis targeting chimera (PROTAC) based on Cereblon ligand, is a potently and selectively Mcl-1 (Bcl-2 family member) inhibitor with an IC50 of 0.78 μM. PROTAC Mcl1 degrader-1 inhibits Bcl-2 with an IC50 of 0.54 μM.