Reaction catalyzed by prolyl oligopeptidase (3.4.21.26)

		+		H2O	=			+
	L-Ala-L-Ala-L-Ala-L-Pro-4-nitroanilide	+		H2O	=		L-Ala-L-Ala-L-Ala-L-Pro	+		4-nitroaniline