(S)-2-ethyl-2-hydroxy-3-oxobutanoate + NADPH + H(+) => (2R,3R)-2,3-dihydroxy-3-methylpentanoate + NADP(+)
(s)-2-ethyl-2-hydroxy-3-oxobutanoate + nadph + h(+) => (2r,3r)-2,3-dihydroxy-3-methylpentanoate + nadp(+)
(S)-2-ethyl-2-hydroxy-3-oxobutanoate + NADPH + H(+) => (2R,3R)-2,3-dihydroxy-3-methylpentanoate + NADP(+)
(s)-2-ethyl-2-hydroxy-3-oxobutanoate + nadph + h(+) => (2r,3r)-2,3-dihydroxy-3-methylpentanoate + nadp(+)