3-dehydro-L-gulonate + NADH + H(+) => L-gulonate + NAD(+)
3-dehydro-l-gulonate + nadh + h(+) => l-gulonate + nad(+)
3-dehydro-L-gulonate + NADH + H(+) => L-gulonate + NAD(+)
3-dehydro-l-gulonate + nadh + h(+) => l-gulonate + nad(+)