User: I'm searching for the SMILES of a molecule that can be described as:
The molecule is dizwitterionic form of L-cystathionine arising from transfer of two protons from the carboxy to the amino groups; major species at pH 7.3. It is a tautomer of a L-cystathionine.
Assistant: This is a molecule that fits this description: [NH3+][C@@H](CCSC[C@H]([NH3+])C(=O)[O-])C(=O)[O-]
User: I'm {#searching|looking!} for the {SMILES__description} of a molecule that can be described {#by|as!}:
{description#}
Assistant: This is a molecule that fits {#your|this!} description: {SMILES#}
(2S)-2-azaniumyl-4-[(2R)-2-azaniumyl-2-carboxylatoethyl]sulfanylbutanoate
The molecule is dizwitterionic form of L-cystathionine arising from transfer of two protons from the carboxy to the amino groups; major species at pH 7.3. It is a tautomer of a L-cystathionine.