Using COc1ccc(-c2nn3ccc(Br)cc3c2C=[N+](C)C)cc1, O=C([O-])O to produce COc1ccc(-c2nn3ccc(Br)cc3c2C=O)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.