4,4'-Dithiobis[2-aminobutyric acid], L-4,4'-dithio-bis(2-aminobutanoic acid), L-4,4'-Dithiobis(2-aminobutyric acid), L-Homocystine, 4,4'-dithiobis[2-amino-Butanoic acid], 4,4'-Disulfanediylbis(2-aminobutanoic acid), 4,4-Dithiobis[2-Aminobutyric] Acid, 4,4'-dithiobis[2-aminobutyric] acid, DL-Homocystine, 4,4-Dithiobis[2-Amino-Butanoic Acid], Butanoic acid, 4,4'-dithiobis[2-amino-