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(+)