Trk-IN-10 (Compound 14j) is a highly effective inhibitor of TRK, with an IC50 of 0.86 nM against TrkA and 6.92 nM against TrkA G595R. As an RTK, Trk is a crucial drug target in solid tumors. Trk-IN-10 (IC50 = 350 nM against ALK) demonstrates superior selectivity in inhibiting Trk, potentially reducing toxicity [1].