Reaction catalyzed by dipeptidyl-peptidase II (3.4.14.2), dipeptidyl-peptidase IV (3.4.14.5), prolyl oligopeptidase (3.4.21.26)

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