Reaction catalyzed by alpha-mannosidase (3.2.1.24), endoplasmic reticulum Man9GlcNAc2 1,2-alpha-mannosidase (3.2.1.209)

		+		H2O	=			+
	4-methylumbelliferyl-alpha-D-mannopyranoside	+		H2O	=		4-methylumbelliferone	+		D-mannose