Using O=C(Cl)CCl, Cc1ccc(NC(=O)c2cccc(C(F)(F)F)c2)cc1Oc1ccc2nc(N)sc2n1 to produce Cc1ccc(NC(=O)c2cccc(C(F)(F)F)c2)cc1Oc1ccc2nc(NC(=O)CCl)sc2n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.