(2E)-hexenoyl-CoA + reduced [electron-transfer flavoprotein] => hexanoyl-CoA + oxidized [electron-transfer flavoprotein] + H(+)
(2e)-hexenoyl-coa + reduced [electron-transfer flavoprotein] => hexanoyl-coa + oxidized [electron-transfer flavoprotein] + h(+)
(2E)-hexenoyl-CoA + reduced [electron-transfer flavoprotein] => hexanoyl-CoA + oxidized [electron-transfer flavoprotein] + H(+)
(2e)-hexenoyl-coa + reduced [electron-transfer flavoprotein] => hexanoyl-coa + oxidized [electron-transfer flavoprotein] + h(+)