Reaction catalyzed by 3alpha-hydroxysteroid 3-dehydrogenase (Si-specific) (1.1.1.50), indanol dehydrogenase (1.1.1.112)

		+		NAD(P)+	=			+		NAD(P)H
	chenodeoxycholic acid	+		NAD(P)+	=		7alpha-hydroxy-3-oxo-5beta-cholan-24-oic acid	+		NAD(P)H