NOVEL PHOSPHATIDYLINOSITOL-3-KINASE INHIBITOR AND PHARMACEUTICAL COMPOSITION
The purpose of the present invention is to provide a novel PI3K inhibitor. The purpose of the present invention is also to provide a substance that combines a PI3K inhibitory effect and an HDAC inhibitory effect. Finally, the present invention further provides a novel anti-cancer pharmaceutical composition containing the substance, in particular an anti-cancer pharmaceutical composition that is effective even against intractable cancer. One embodiment of the present invention is a phosphatidylinositol-3-kinase (PI3K) inhibitor comprising a depsipeptide-class compound represented by formula (1), or a physiologically acceptable salt thereof.