Using O=C(Oc1cc(CBr)ccc1F)c1ccccc1, Cc1ccc(Cl)c(OC(=O)c2ccccc2)c1 to produce O=C(Oc1cc(CBr)ccc1Cl)c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.