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(+)