2-Amino-4-mercaptobutyric acid 6027-13-0 Butanoic acid, 2-amino-4-mercapto- Butanoic acid, 2-amino-4-mercapto-, (S)- Butyric acid, 2-amino-4-mercapto- Butyric acid, 2-amino-4-mercapto-, L- Homocysteine Homocysteine, L- L-Homocysteine NSC118376