TC13172 is a potent and covalent inhibitor that specifically targets the mixed lineage kinase domain-like protein (MLKL), exhibiting significant selectivity for MLKL over the closely related receptor-interacting serine/threonine kinase 1 (RIPK1) and RIPK3 at a concentration of 10 µM.TC13172 effectively inhibits necroptosis induced by the TSZ combination (TNF-α, a Smac mimetic, and Z-VAD-FMK) in HT-29 cells with a EC50 of 2 nM and, at 100 nM, blocks TSZ-induced oligomerization and plasma membrane translocation of MLKL.