Type II TRK inhibitor 1 is a potent TRK inhibitor, which inhibits various TRK fusion protein variants and wild type. Type II TRK inhibitor 1 exhibits antiproliferative activity against Ba/F3 cells harboring CD74-TRKA G667C and ETV6-TRKC G696C fusion proteins with IC 50 s of 6 nM and 1.7 nM, respectively. Type II TRK inhibitor 1 is a click chemistry reagent, it contains an Alkyne group and can undergo copper-catalyzed azide-alkyne cycloaddition (CuAAc) with molecules containing Azide groups.