Using O=C(C(Br)Br)C(F)(F)F, NNc1cc(Oc2ncccn2)c(Cl)cc1F to produce O=C(C=NNc1cc(Oc2ncccn2)c(Cl)cc1F)C(F)(F)F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.