Using CC(O)c1c(-c2ccccc2)c2cc(Br)ccc2c(=O)n1Cc1ccccc1 to produce CC(=O)c1c(-c2ccccc2)c2cc(Br)ccc2c(=O)n1Cc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.