Using COC(=O)CC(=O)c1ccc(OCCCC(F)(F)F)cc1, BrCCBr to produce COC(=O)C1(C(=O)c2ccc(OCCCC(F)(F)F)cc2)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.