Using COC(=O)CC(N)C(=O)O, O=[N+]([O-])c1ccccc1SCl to produce COC(=O)CC(NSc1ccccc1[N+](=O)[O-])C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.