Reaction catalyzed by adenine phosphoribosyltransferase (2.4.2.7)

		+			=			+
	4-carbamoylimidazolium 5-olate	+		5-phospho-alpha-D-ribose 1-diphosphate	=		4-carbamoylimidazolium 5-olate 5'-phosphate	+		diphosphate