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(+)