Using O=C(Cl)CCBr, O=C(O)[C@@H]1CSC(c2ccccc2O)N1 to produce O=C(O)[C@@H]1CSC(c2ccccc2O)N1C(=O)CCBr, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.