(R)-malate + NADH + 2 H(+) => (3R)-3-hydroxy-4-oxobutanoate + NAD(+) + H2O
(r)-malate + nadh + 2 h(+) => (3r)-3-hydroxy-4-oxobutanoate + nad(+) + h2o
(R)-malate + NADH + 2 H(+) => (3R)-3-hydroxy-4-oxobutanoate + NAD(+) + H2O
(r)-malate + nadh + 2 h(+) => (3r)-3-hydroxy-4-oxobutanoate + nad(+) + h2o