Reaction catalyzed by guanosine-3',5'-bis(diphosphate) bisphosphatase (3.6.1.B16)

		+	2	H2O	=			+	2
	guanosine 3',5'-bis(diphosphate)	+		2 H2O	=		guanosine 3',5'-bisphoshate	+		2 phosphate