Using OB(O)c1ccccc1, O=C1c2ccccc2C(=O)N1Cc1cc2cc(Cl)cc(Br)c2o1 to produce O=C1c2ccccc2C(=O)N1Cc1cc2cc(Cl)cc(-c3ccccc3)c2o1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.