7rh (DDR1-IN-2) is a potent inhibitor of discoidin domain receptor 1 ( DDR1 ), with an IC 50 of 13.1 nM, and also less potently inhibits DDR2 , with an IC 50 of 203 nM. 7rh is a click chemistry reagent, it contains an Alkyne group and can undergo copper-catalyzed azide-alkyne cycloaddition (CuAAc) with molecules containing Azide groups.