Using OB(O)c1cc(F)cc(Cl)c1, CCOC(=O)c1nc(-c2ccc(F)c(Cl)c2)c(Br)s1 to produce O=C(O)c1nc(-c2ccc(F)c(Cl)c2)c(-c2cc(F)cc(Cl)c2)s1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.