Using O=C(O)c1ccncc1, Nc1c(O)ccc(Cl)c1C(F)(F)F to produce O=C(Nc1c(O)ccc(Cl)c1C(F)(F)F)c1ccncc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.