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