2-methylfumaryl-CoA + reduced [electron-transfer flavoprotein] => (2S)-methylsuccinyl-CoA + oxidized [electron-transfer flavoprotein] + H(+)
2-methylfumaryl-coa + reduced [electron-transfer flavoprotein] => (2s)-methylsuccinyl-coa + oxidized [electron-transfer flavoprotein] + h(+)
2-methylfumaryl-CoA + reduced [electron-transfer flavoprotein] => (2S)-methylsuccinyl-CoA + oxidized [electron-transfer flavoprotein] + H(+)
2-methylfumaryl-coa + reduced [electron-transfer flavoprotein] => (2s)-methylsuccinyl-coa + oxidized [electron-transfer flavoprotein] + h(+)