ursodeoxycholate 7-beta-dehydrogenase (NAD+) activity
ursodeoxycholate 7-beta-dehydrogenase (nad+) activity
ursodeoxycholate + NAD(+) = 7-oxolithocholate + NADH + H(+)
ursodeoxycholate + nad(+) = 7-oxolithocholate + nadh + h(+)