Using CC(O)c1c(Cl)nc(-c2ccccc2)n1Cc1ccc(Br)cc1 to produce CC(=O)c1c(Cl)nc(-c2ccccc2)n1Cc1ccc(Br)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.