Using O=C(Cl)CBr, O=C1NC(c2ccccc2)(c2ccccc2)C(=O)N1CO to produce O=C(CBr)OCN1C(=O)NC(c2ccccc2)(c2ccccc2)C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.