(2R,3S)-3-methylmalate + NAD(+) => 3-carboxy-2-oxobutanoate + NADH + H(+)
(2r,3s)-3-methylmalate + nad(+) => 3-carboxy-2-oxobutanoate + nadh + h(+)
(2R,3S)-3-methylmalate + NAD(+) => 3-carboxy-2-oxobutanoate + NADH + H(+)
(2r,3s)-3-methylmalate + nad(+) => 3-carboxy-2-oxobutanoate + nadh + h(+)