Reaction catalyzed by 3alpha(17beta)-hydroxysteroid dehydrogenase (NAD+) (1.1.1.239)

		+		NAD+	=			+		NADH
	androst-5-ene-3beta,17beta-diol	+		NAD+	=		androst-5-ene-3beta-ol-17-one	+		NADH