4-hydroxybutanoate + NAD(+) = succinate semialdehyde + NADH + H(+)
4-hydroxybutanoate + nad(+) = succinate semialdehyde + nadh + h(+)
4-hydroxybutanoate + NAD(+) = succinate semialdehyde + NADH + H(+)
4-hydroxybutanoate + nad(+) = succinate semialdehyde + nadh + h(+)