Using BrCCCBr, FC(F)(F)c1cccc(CNCC(c2ccccc2)c2ccccc2)c1Cl to produce FC(F)(F)c1cccc(CN(CCCBr)CC(c2ccccc2)c2ccccc2)c1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.