Using OCCCl, O=C(c1nc2cc(Cl)c(Cl)cc2[nH]1)C(F)(F)F to produce FC(F)(F)C1(c2nc3cc(Cl)c(Cl)cc3[nH]2)OCCO1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.