Xanthine oxidase-IN-5 is an effective and orally active xanthine oxidase ( XO ) inhibitor with IC 50 value of 0.70 μM. Xanthine oxidase-IN-5 displays favorable agent-like properties with ligand efficiency (LE) and lipophilic ligand efficiency (LLE) values of 0.33 and 3.41, respectively. Xanthine oxidase-IN-5 shows potent hypouricemic effects in hyperuricemic rat model.