precorrin-3A + NADH + O2 + 2 H(+) => precorrin-3B + NAD(+) + H2O
precorrin-3a + nadh + o2 + 2 h(+) => precorrin-3b + nad(+) + h2o
precorrin-3A + NADH + O2 + 2 H(+) => precorrin-3B + NAD(+) + H2O
precorrin-3a + nadh + o2 + 2 h(+) => precorrin-3b + nad(+) + h2o