2-hydroxybutanoate + NADP(+) <=> 2-oxobutanoate + NADPH + H(+)
2-hydroxybutanoate + nadp(+) <=> 2-oxobutanoate + nadph + h(+)
2-hydroxybutanoate + NADP(+) <=> 2-oxobutanoate + NADPH + H(+)
2-hydroxybutanoate + nadp(+) <=> 2-oxobutanoate + nadph + h(+)