Using CCc1ccc(Br)cc1C1C(=O)C2C(C1=O)C1(C)C=CC2(C)O1 to produce CCc1ccc(Br)cc1C1C(=O)C2C(C1=O)C1(C)CCC2(C)O1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.