chenodeoxycholate 7-alpha-dehydrogenase (NAD+) activity
chenodeoxycholate 7-alpha-dehydrogenase (nad+) activity
chenodeoxycholate + NAD(+) = 7-oxolithocholate + NADH + H(+)
chenodeoxycholate + nad(+) = 7-oxolithocholate + nadh + h(+)