An inhibitor of RalA and RalB; binds to RalB when it is bound to GDP (Kd = 7.7 μM); decreases RalA and RalB activity in H2122 and H358 cells at 10 μM; inhibits colony formation of Ral-dependent H2122 and H358 cells (IC50s = 2 and 1.3 μM, respectively); decreases RalA and RalB activity and reduces tumor growth in an H2122 mouse xenograft model at 10, 20, and 50 mg/kg