2 reduced [2Fe-2S]-[ferredoxin] + 2 CO2 + NADH + H(+) => 2 formate + 2 oxidized [2Fe-2S]-[ferredoxin] + NAD(+)
2 reduced [2fe-2s]-[ferredoxin] + 2 co2 + nadh + h(+) => 2 formate + 2 oxidized [2fe-2s]-[ferredoxin] + nad(+)