Using O=C([O-])O, Cc1cc(Nc2cccc(Br)c2)c2ccccc2n1 to produce Cc1cc(Nc2cccc(-c3cccc(C=O)c3)c2)c2ccccc2n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.