Using OB(O)c1ccsc1, CCOC(=O)C1=Cc2cc(Cl)c(CBr)cc2OC1C(F)(F)F to produce CCOC(=O)C1=Cc2cc(Cl)c(Cc3ccsc3)cc2OC1C(F)(F)F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.