Using O=C(O)CCC(F)(F)C(F)(F)F, COC(=O)c1cc(Cl)ccc1Br to produce O=C(CCC(F)(F)C(F)(F)F)c1cc(Cl)ccc1Br, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.