CBI1 formic is a covalent inhibitor of BAX, selectively derivatizing BAX at C126 and inhibiting its activation by triggering with a ligand or point mutation. This compound effectively blocks the t-2-hex lipidation and oligomerization of BAX. Additionally, CBI1 formic inhibits BAX activation induced by BH3 ligands, F116A mutations, or t-2-hex.