dihydroxyfumarate + NADH + H(+) => (2R,3S)-tartrate + NAD(+)
dihydroxyfumarate + nadh + h(+) => (2r,3s)-tartrate + nad(+)
dihydroxyfumarate + NADH + H(+) => (2R,3S)-tartrate + NAD(+)
dihydroxyfumarate + nadh + h(+) => (2r,3s)-tartrate + nad(+)