VISTA-IN-2 (Compound 1) is an inhibitor of V-domain Ig suppressor of T-cell activation (VISTA) . VISTA-IN-2 induces VISTA degradation in cells through an autophagic mechanism. VISTA-IN-2 rescues VISTA-mediated immunosuppression, and enhances antitumor activity of immune cells. VISTA-IN-2 also activates the antitumor immunity and inhibits tumor growth in a CT26 mouse model[1].