A pan-Trk inhibitor (IC50s = 2-20 nM for TrkA, TrkB, and TrkC); selective for TrkA, -B, and -C over a panel of 226 kinases at 1 μM; inhibits the growth of CUTO-3.29, KM12, and MO-91 patient-derived cancer cell lines (IC50s = <100, <10, and <10 nM, respectively); reduces tumor growth in a KM12 mouse xenograft model at 60 and 200 mg/kg ,