Reaction catalyzed by Oligopeptidase B (3.4.21.83)

		+		H2O	=			+
	acetyl-L-Leu-L-Lys-L-Arg-4-nitroanilide	+		H2O	=		acetyl-L-Leu-L-Lys-L-Arg	+		4-nitroaniline