Reaction catalyzed by arylsulfatase (type I) (3.1.6.1), steryl-sulfatase (3.1.6.2), N-acetylgalactosamine-4-sulfatase (3.1.6.12)

		+		H2O	=			+
	4-methylumbelliferyl sulfate	+		H2O	=		4-methylumbelliferol	+		sulfate