3alpha-hydroxy-5alpha-pregnan-20-one + NAD(+) <=> 5alpha-pregnane-3,20-dione + NADH + H(+)
3alpha-hydroxy-5alpha-pregnan-20-one + nad(+) <=> 5alpha-pregnane-3,20-dione + nadh + h(+)
3alpha-hydroxy-5alpha-pregnan-20-one + NAD(+) <=> 5alpha-pregnane-3,20-dione + NADH + H(+)
3alpha-hydroxy-5alpha-pregnan-20-one + nad(+) <=> 5alpha-pregnane-3,20-dione + nadh + h(+)