Reaction catalyzed by cathepsin B (3.4.22.1), CPB protease (3.4.22.B5)

		+		H2O	=			+
	benzyloxycarbonyl-Phe-Arg-p-nitroanilide	+		H2O	=		benzyloxycarbonyl-Phe-Arg	+		p-nitroaniline