Potent, ATP-competitive inhibitor of mammalian target of rapamycin (mTOR) (IC50 = 7 nM). Displays selectivity for mTOR over PI 3-Kα (~100-fold) and PI 3-Kγ (~500-fold). Inhibits phosphorylation of mTORC1 and mTORC2 substrates including S6K, SGK and Akt; blocks VEGF secretion and HIF-1α expression. Exhibits antiproliferative effects in cancer cell lines through G1 cell cycle arrest and selective apoptosis. Purity 98%. MW (observed): 601.53