Using BrCCCBr, COC(=O)c1ccc(O)c(-c2ccc(C(F)(F)F)cc2)c1 to produce COC(=O)c1ccc(OCCCBr)c(-c2ccc(C(F)(F)F)cc2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.