preferred_name: butanoyl-CoA + oxidized [electron-transfer flavoprotein] + H(+) <=> (2E)-butenoyl-CoA + reduced [electron-transfer flavoprotein]
preferred_name_lc: butanoyl-coa + oxidized [electron-transfer flavoprotein] + h(+) <=> (2e)-butenoyl-coa + reduced [electron-transfer flavoprotein]
label: butanoyl-CoA + oxidized [electron-transfer flavoprotein] + H(+) <=> (2E)-butenoyl-CoA + reduced [electron-transfer flavoprotein]
label_lc: butanoyl-coa + oxidized [electron-transfer flavoprotein] + h(+) <=> (2e)-butenoyl-coa + reduced [electron-transfer flavoprotein]