L-idonate + NAD(+) = 2-dehydro-L-idonate + NADH + H(+)
l-idonate + nad(+) = 2-dehydro-l-idonate + nadh + h(+)
L-idonate + NAD(+) = 2-dehydro-L-idonate + NADH + H(+)
l-idonate + nad(+) = 2-dehydro-l-idonate + nadh + h(+)