2-Amino-4-mercaptobutyric acid 2-Amino-4-mercaptobutyric acid (VAN) 454-28-4 6027-13-0 Butanoic acid, 2-amino-4-mercapto- (VAN) Butanoic acid, 2-amino-4-mercapto-, (S)- Butyric acid, 2-amino-4-mercapto- Butyric acid, 2-amino-4-mercapto- (8CI) Butyric acid, 2-amino-4-mercapto-, L- (8CI) EINECS 227-891-0 Homocysteine Homocysteine (VAN) L-Homocysteine NSC 118376 NSC 43117