sirohydrochlorin + NADH + 2 H(+) => precorrin-2 + NAD(+)
sirohydrochlorin + nadh + 2 h(+) => precorrin-2 + nad(+)
sirohydrochlorin + NADH + 2 H(+) => precorrin-2 + NAD(+)
sirohydrochlorin + nadh + 2 h(+) => precorrin-2 + nad(+)