Reaction catalyzed by mannitol 2-dehydrogenase (1.1.1.67)

		+		polyethyleneglycol-NH-succinyl-aminoethyl-NAD+	=			+		polyethyleneglycol-NH-succinyl-aminoethyl-NADH
	D-mannitol	+		polyethyleneglycol-NH-succinyl-aminoethyl-NAD+	=		D-fructose	+		polyethyleneglycol-NH-succinyl-aminoethyl-NADH