Potent and selective dual ATP-competitive PI 3-K/mTOR inhibitor (Ki values are 1.6, 1.8, 1.9, 2.1 and 16 nM for human PI 3-K δ, α, γ, β, and mTOR, respectively). Displays no significant inhibitory activity at more than 80 protein kinases (concentration ≥ 10 μM) including hVps34, PI 3-K downstream kinases, and MAPK family members. Orally available. Induces robust cell cycle arrest at the G1 phase in U87MG cancer cells and antitumor activity in SKOV3 ovarian cancer xenograft models. Purity 98%. MW (observed): 425.48