.alpha.-Amino-.gamma.-methylmercaptobutyric acid .gamma.-Methylthio-.alpha.-aminobutyric acid 2-Amino-4-(methylthio)butyric acid 2-Amino-4-methylthiobutanoic acid 63-68-3 Butanoic acid, 2-amino-4-(methylthio)-, (S)- Butyric acid, 2-amino-4-(methylthio)- Cymethion L(-)-Amino-.gamma.-methylthiobutyric acid L-(-)-Methionine L-.alpha.-Amino-.gamma.-methylmercaptobutyric acid L-.gamma.-Methylthio-.alpha.-aminobutyric acid L-Methionine METHIONINE,L- Met Methionine Methionine, L- NSC22946 S-Methionine WLN: QVYZ2S1 -L