Using COc1cc(Br)c(C(O)c2ccc(C)cc2)cc1OCc1ccccc1 to produce COc1cc(Br)c(C(=O)c2ccc(C)cc2)cc1OCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.