(2R,3S)-3-methylmalate + NAD(+) = 2-oxobutanoate + CO2 + NADH
(2r,3s)-3-methylmalate + nad(+) = 2-oxobutanoate + co2 + nadh
(2R,3S)-3-methylmalate + NAD(+) = 2-oxobutanoate + CO2 + NADH
(2r,3s)-3-methylmalate + nad(+) = 2-oxobutanoate + co2 + nadh