Reaction catalyzed by 2,3-dihydroxybenzoate 3,4-dioxygenase (1.13.11.14), 3,4-dihydroxyphenylacetate 2,3-dioxygenase (1.13.11.15)

		+			=			+
	2,3-dihydroxybenzoate	+		O2	=		CO2	+		alpha-hydroxymuconic semialdehyde