Using COC(=O)c1ncsc1S, CC(=O)OCC1=C(C(=O)O)N2C(=O)[C@@H](N)[C@H]2SC1 to produce COC(=O)c1ncsc1SCC1=C(C(=O)O)N2C(=O)C(N)[C@H]2SC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.