Using ClCCCCBr, O=c1nc(-c2cccc3c2OC(F)(F)O3)cc[nH]1 to produce O=c1nc(-c2cccc3c2OC(F)(F)O3)ccn1CCCCCl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.