Using O=C(Nc1cc(F)c(Oc2ccnc3[nH]ccc23)c(F)c1)C(F)(F)F, O=C1CCC(=O)N1Cl to produce O=C(Nc1cc(F)c(Oc2ccnc3[nH]cc(Cl)c23)c(F)c1)C(F)(F)F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.