label: butanoyl-CoA + 2 reduced [2Fe-2S]-[ferredoxin] + 2 NAD(+) => (2E)-butenoyl-CoA + 2 oxidized [2Fe-2S]-[ferredoxin] + 2 NADH
label_lc: butanoyl-coa + 2 reduced [2fe-2s]-[ferredoxin] + 2 nad(+) => (2e)-butenoyl-coa + 2 oxidized [2fe-2s]-[ferredoxin] + 2 nadh