precorrin-6A + NADPH + 2 H(+) => precorrin-6B + NADP(+)
precorrin-6a + nadph + 2 h(+) => precorrin-6b + nadp(+)
precorrin-6A + NADPH + 2 H(+) => precorrin-6B + NADP(+)
precorrin-6a + nadph + 2 h(+) => precorrin-6b + nadp(+)