Task: Please answer the following question about the molecule with SMILES NCCS.O=C(O)C(O)C(O)C(=O)O.
Description: Please provide a description of this drug's mechanism of action.
Completion: Cystine reducing agent
Task: Please answer the following question about the molecule with {SMILES__description} {SMILES#}.
{#Description|Question|Request!}: {quest#}
{#Result|Answer|Completion!}: {answ#}
NCCS.O=C(O)C(O)C(O)C(=O)O
NCCS.O=C(O)C(O)C(O)C(=O)O
2-aminoethanethiol;2,3-dihydroxybutanedioic acid
Please provide a description of this drug's mechanism of action.