Using CCOC(=O)COc1ccc(C(=O)c2ccnn2CC)c(Cl)c1Cl, [O-][Br+][O-] to produce CCOC(=O)COc1ccc(C(=O)c2c(Br)cnn2CC)c(Cl)c1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.