PIK-75 is a selective cell-permeable inhibitor of PI 3-kinase p110α (IC50 values are 5.8, 76 nM and 1.3 μM at PI 3-kinase p110α, PI 3-kinase p110γ and PI 3-kinase p110β respectively). Inhibits production of PIP2 and PIP3 in adipocytes, phosphorylation of