HSP70-IN-3 is a potent HSP70 inhibitor ( IC 50 s of 1.1 and 1.9 μM in ASZ001 and C3H10T1/2, respectively). HSP70-IN-3 has anti-Hh ( Hedgehog signaling) activity and anti-proliferative activity and reduces expression of the oncogenic transcription factor GLI1.