L-2-Aminobutanamide hydrochloride, English name is L-2-Aminobutanamide hydrochloride, Chinese alias is ABAH; (S)-2-Aminobutanamide hydrochloride, CAS number is 7682-20-4, molecular formula is C4H11ClN2O, a white or off-white solid powder, is used as an anti-epileptic and anti-convulsant drug intermediate.