Using O=C(NC1CCC(C(F)(F)F)CC1)c1ccc(Cl)nc1Cl, OCCF to produce O=C(N[C@H]1CC[C@H](C(F)(F)F)CC1)c1ccc(Cl)nc1OCCF, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.