label: 12alpha-hydroxy-3-oxo-5beta-cholan-24-oate + NAD(+) = 12alpha-hydroxy-3-oxochola-4-en-24-oate + NADH + H(+)
label_lc: 12alpha-hydroxy-3-oxo-5beta-cholan-24-oate + nad(+) = 12alpha-hydroxy-3-oxochola-4-en-24-oate + nadh + h(+)