Reaction catalyzed by aryldialkylphosphatase (3.1.8.1)

		+		H2O	=			+
	3-chloro-4-methyl-2-oxo-2H-chromen-7-yl ethyl methylphosphonate	+		H2O	=		3-chloro-7-hydroxy-4-methyl-2H-chromen-2-one	+		ethyl methylphosphonate