PI-103是一种多靶点的PI3K抑制剂，对p110α的抑制效果最好，IC50为2 nM (对p110β/δ/γ抑制效果稍弱)，也抑制mTORC1/2和DNA-PK ，IC50分别为20 nM/83 nM和8 nM。An ATP-competitive DNA-PK, PI 3-kinase, and FRAP inhibitor. PI-103 is a multi-targeted PI3K inhibitor for p110α/β/δ/γ with IC50 of 2 nM/3 nM/3 nM/15 nM in cell-free assays, less potent to mTOR/DNA-PK with IC50 of 30 nM/23 nM. An ATP-competitive DNA-PK, PI 3-kinase, and FRAP inhibitor.