SMILES: C(C(C(=O)NCC(=O)[O-])[NH3+])SSCC(C(=O)NCC(=O)[O-])[NH3+]
Description: The molecule is a peptide zwitterion obtained by transfer of two protons from the carboxy to the amino groups of Cys-Gly disulfide; major species at pH 7.3. It is a tautomer of a Cys-Gly disulfide.