WYE-354 is a potent, selective, and ATP-competitive mTOR inhibitor with an IC50 of 5 nM. It effectively suppresses mTORC2-mediated P-AKT(S473) and mTORC1-mediated P-S6K(T389) signaling, demonstrating high selectivity over PI3K isoforms. This inhibitor is a valuable tool for investigating mTOR pathway biology in both cellular and in vivo cancer research models.