Reaction catalyzed by heptaprenyl diphosphate synthase (2.5.1.30), trifunctional (all-E)-isoprenyl diphospate synthase (2.5.1.B41)

		+	4		=	4		+
	(2E,6E)-farnesyl diphosphate	+		4 isopentenyl diphosphate	=		4 diphosphate	+		all-trans-heptaprenyl diphosphate