(17R,20S)-17,20-dihydroxypregn-4-en-3-one + NAD(+) => 17alpha-hydroxyprogesterone + NADH + H(+)
(17r,20s)-17,20-dihydroxypregn-4-en-3-one + nad(+) => 17alpha-hydroxyprogesterone + nadh + h(+)
(17R,20S)-17,20-dihydroxypregn-4-en-3-one + NAD(+) => 17alpha-hydroxyprogesterone + NADH + H(+)
(17r,20s)-17,20-dihydroxypregn-4-en-3-one + nad(+) => 17alpha-hydroxyprogesterone + nadh + h(+)