4-hydroxybutanoate + NADP(+) => succinate semialdehyde + NADPH + H(+)
4-hydroxybutanoate + nadp(+) => succinate semialdehyde + nadph + h(+)
4-hydroxybutanoate + NADP(+) => succinate semialdehyde + NADPH + H(+)
4-hydroxybutanoate + nadp(+) => succinate semialdehyde + nadph + h(+)