SMILES: C([C@H](C(=O)[O-])[NH3+])SSC[C@H](C(=O)[O-])[NH3+]
Description: The molecule is a cysteine zwitterion derived from D-cysteine by transfer of a proton from each of the carboxy groups to the amino groups. It is an enantiomer of a L-cystine zwitterion. It is a tautomer of a D-cystine.