succinate + NADH + 2 H(+) => succinate semialdehyde + NAD(+) + H2O
succinate + nadh + 2 h(+) => succinate semialdehyde + nad(+) + h2o
succinate + NADH + 2 H(+) => succinate semialdehyde + NAD(+) + H2O
succinate + nadh + 2 h(+) => succinate semialdehyde + nad(+) + h2o