4-PQBH is a potent Nur77-binding agent with antitumour activity.4-PQBH inhibits xenograft tumours through Nur77-mediated endoplasmic stress and autophagy by broadly inducing cysteoaspartase-independent cytoplasmic vacuolisation and parapetaloid ptosis.4-PQBH is used in the study of hepatocellular carcinoma.4-PQBH is a potent Nur77-binding agent with antitumour activity.