(R)-pantoate + NAD(+) <=> 2-dehydropantoate + NADH + H(+)
(r)-pantoate + nad(+) <=> 2-dehydropantoate + nadh + h(+)
(R)-pantoate + NAD(+) <=> 2-dehydropantoate + NADH + H(+)
(r)-pantoate + nad(+) <=> 2-dehydropantoate + nadh + h(+)