(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(+) = dihydroxyfumarate + nadh + h(+)