Using COc1c(C(C)=O)cc2c(c1Br)C(C)(C)CC=C2C(C)(C)C to produce CC(=O)c1cc2c(c(Br)c1O)C(C)(C)CC=C2C(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.