Cell permeable, reversible, potent and specific inhibitor of phosphoinositide 3-kinase (IC50=17nM for PI(3)K p110beta, IC50=53nM for PI(3)K p110gamma and IC50=6nM for PI(3)K p110delta). Blocks cellular PI(3)K/Akt (PKB) signalling in vitro and inhibits Akt(PKB)-depe