Using CC(C)(C)C(=O)Oc1cccc(C=O)c1O, COC(=O)c1ccc(CBr)cc1 to produce COC(=O)c1ccc(COc2c(C=O)cccc2OC(=O)C(C)(C)C)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.