Reaction catalyzed by ribosyldihydronicotinamide dehydrogenase (quinone) (1.10.5.1)

		+			=			+
	N-methyldihydronicotinamide	+		3-hydroxy-1-methylindoline-5,6-dione	=		N-methylnicotinamide	+		3-hydroxy-1-methylindoline-5,6-diol