4,4'-Dithiobis(2-aminobutyric acid) 4,4'-Dithiobis(2-aminobutyric) acid 462-10-2 Butanoic acid, 4,4'-dithiobis(2-amino- (9CI) Butyric acid, 4,4'-dithiobis(2-amino- (8CI) EINECS 207-323-8 HOMOCYSTINE NSC 11337 NSC 226570