Using CCOC(=O)Cc1cc(Cl)c(OCC(F)(F)F)c(Br)c1, BrCCCBr to produce CCOC(=O)C1(c2cc(Cl)c(OCC(F)(F)F)c(Br)c2)CCC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.