Inauhzin (INZ) is a potent p53 activator and mediates p53-dependent cytotoxicity. INZ inhibits cell proliferation by triggering both apoptosis and senescence in p53-containning cells, though it predominantly induces p53-dependent apoptosis. INZ is able to prevent p53 from MDM2-mediated ubiquitylation and proteasomal degradation and protects p53 without either directly inhibiting MDM2 activity towards p53 or interfering with MDMX/MDM2–p53 interaction. INZ induces acetylation of p53, but not tubulin, in cells. Inauhzin is a (sub)micromolar SIRT1i selective over SIRT2/3.