DAG Kinase Inhibitor is an inhibitor of DGK (Diacylglycerol kinase; DAG Kinase) and is useful for elucidating the roles of protein kinase C (PKC). DAG Kinase Inhibitor has also been reported to inhibit DGK in several systems such as isolated platelet membranes, whole platelets and ghost erythrocytes. Additional reports have shown to inhibit in a concentration dependent manner. DAG Kinase Inhibitor may also inhibit other pathways such as NADPH and potentially interfere with the lipid-mediated assembly process of oxidase components as reported using a cell-free system. This particular isoform, R59949, has been reported to potentially exhibit selective inhibition of DGK-α.