An inhibitor of TrkA and TrkC (IC50s = 0.6 and G595R, TrkAG667C, TrkCG623R, and TrkCG696A (IC50s = 2, 9.8, 2.3, and 50 = 1.9 nM); selectively inhibits proliferation of Trk fusion-positive K12, CUTO-3, and MO-91 cell lines (IC50s = ≤5 nM) over Trk fusion-negative cell lines; reduces tumor growth in TrkA-dependent KM12, as well as NIH 3T3 ΔTrkA, ΔTrkA + TrkAG595R, and ΔTrkA + TrkAG667C mouse xenograft models at ≥30 mg/kg