Using CC(=O)OCCBr, O=C1NC(Cc2ccccc2Cl)C(=O)Nc2ccc(Cl)cc21 to produce CC(=O)OCCN1C(=O)C(Cc2ccccc2Cl)NC(=O)c2cc(Cl)ccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.