COTI-2, an anti-cancer agent with low toxicity, is an orally available third generation activator of p53 mutant forms. COTI-2 acts both by reactivating mutant p53 and inhibiting the PI3K/AKT/mTOR pathway. COTI-2 induces apoptosis in multiple human tumor cell lines. COTI-2 exhibits antitumor activity in HNSCC through p53-dependent and -independent mechanisms. COTI-2 converts mutant p53 to wild-type conformation.