Potent and selective dual inhibitor of PI 3-kinase/mTOR (IC50 values are 0.4, 1.6 and 5.4 nM for PI 3-Kα, mTOR and PI 3-Kγ respectively). Exhibits selectivity over 234 other protein kinases (IC50 >10 μM). Potently inhibits tumor cell growth in 37 different tumor cell lines (IC50 < 100 nM). Also exhibits antitumor activity in MDA-361, HCT-116, H1975 and U87MG xenograft models. Purity 98%. MW (observed): 615.73