Reaction catalyzed by trypsin (3.4.21.4)

		+			=			+
	Nalpha-Boc-D-Ala-(p-amidino)phenyl ester	+		D-Ala-4-nitroanilide	=		Nalpha-Boc-D-Ala-D-Ala-4-nitroanilide	+		4-hydroxybenzimidamide