Task: Please answer the following question about the molecule with SMILES N[C@@H](CCSC[C@H](N)C(=O)O)C(=O)O.
Request: Please describe this drug.
Result: Cystathionine is a metabolite found in or produced by Escherichia coli (strain K12, MG1655).
Task: Please answer the following question about the molecule with {SMILES__description} {SMILES#}.
{#Description|Question|Request!}: {quest#}
{#Result|Answer|Completion!}: {answ#}
N[C@@H](CCSC[C@H](N)C(=O)O)C(=O)O
C(CSC[C@@H](C(=O)O)N)[C@@H](C(=O)O)N
(2S)-2-amino-4-[(2R)-2-amino-2-carboxyethyl]sulfanylbutanoicacid
Please describe this drug.