The molecule is dianion of bis-gamma-glutamylcystine arising from deprotonation of all four carboxy groups and protonation of both amino groups; major species at pH 7.3. It is a conjugate base of a bis-gamma-glutamylcystine.
2-azaniumyl-5-[[2-[[2-[(4-azaniumyl-4-carboxylatobutanoyl)amino]-2-carboxylatoethyl]disulfanyl]-1-carboxylatoethyl]amino]-5-oxopentanoate