3‑({4‑[4‑(Acridin‑9‑ylamino)phenylthio]phenyl}(3‑hydroxypropyl)amino)propan‑1‑ol (CK0403) is a sulfur‑containing 9‑anilinoacridine analogue of amsacrine and was found to be more potent than its analogue 2-({4-[4-(acridin-9-ylamino)phenylthio]phenyl}(2‑hydroxyethyl)amino)ethan‑1‑ol (CK0402) and