Using Fc1ccc(C2(c3ccc(Cl)cc3Cl)Oc3cc(F)c(Br)cc3O2)cc1, O=C=O to produce O=C(O)c1cc2c(cc1F)OC(c1ccc(F)cc1)(c1ccc(Cl)cc1Cl)O2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.