SJ 11646, a potent lymphocyte-specific protein tyrosine kinase (LCK) Degrader (PROTAC) with a DC50 of 0.00838 pM, utilizes Dasatinib as the LCK ligand and incorporates a phenyl glutarimide-based cereblon binder. Demonstrating cytotoxicity in both LCK-activated T cell acute lymphoblastic leukemia (T-ALL) cell lines and primary leukemia samples in vitro, SJ 11646 also exhibits anti-leukemic efficacy in vivo within patient-derived xenograft models of T-ALL.