(3R)-3-hydroxy-4-oxobutanoate + NADP(+) + H2O = (R)-malate + NADPH + 2 H(+)
(3r)-3-hydroxy-4-oxobutanoate + nadp(+) + h2o = (r)-malate + nadph + 2 h(+)
(3R)-3-hydroxy-4-oxobutanoate + NADP(+) + H2O = (R)-malate + NADPH + 2 H(+)
(3r)-3-hydroxy-4-oxobutanoate + nadp(+) + h2o = (r)-malate + nadph + 2 h(+)