Co-precorrin-6B + NAD(+) = Co-precorrin-6A + NADH + H(+)
co-precorrin-6b + nad(+) = co-precorrin-6a + nadh + h(+)
Co-precorrin-6B + NAD(+) = Co-precorrin-6A + NADH + H(+)
co-precorrin-6b + nad(+) = co-precorrin-6a + nadh + h(+)