Reaction catalyzed by 2-[(L-alanin-3-ylcarbamoyl)methyl]-2-hydroxybutanedioate decarboxylase (4.1.1.117)

		=		citryl-diaminoethane	+
	citryl-L-2,3-diaminopropionic acid	=		citryl-diaminoethane	+		CO2