Using Nc1ncc(Cc2ccccc2Cl)s1, O=C(O)C(Br)c1ccccc1 to produce O=C(Nc1ncc(Cc2ccccc2Cl)s1)C(Br)c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.