Reaction catalyzed by glucan 1,4-alpha-glucosidase (3.2.1.3), alpha-glucosidase (3.2.1.20), glucan 1,6-alpha-glucosidase (3.2.1.70), glucan 1,4-alpha-maltotriohydrolase (3.2.1.116), alpha-D-xyloside xylohydrolase (3.2.1.177)

		+		H2O	=			+
	maltotetraose	+		H2O	=		maltotriose	+		D-glucose