Sec7-specific GEF inhibitor that displays selectivity for small GEFs of the cytohesin family (IC50 values are 2.4, 5.4, 5.4, 5.6, 5.6, 65 and > 100 μM for hCyh2, hCyh1, mCyh3, hCyh3, drosophila steppke, yGea2-S7 and hEFA6-S7 respectively). Inhibits insulin signaling via inhibition of insulin receptor substrate protein (IRS) phosphorylation.