Reaction catalyzed by inositol-polyphosphate 5-phosphatase (3.1.3.56)

		+		H2O	=			+
	1D-myo-inositol 1,2,3,4,5-pentakisphosphate	+		H2O	=		1D-myo-inositol 1,2,3,4-tetrakisphosphate	+		phosphate