Using CON(C)C(=O)C(F)(F)F, FC1(F)Oc2ccc(Br)cc2C1(F)F to produce O=C(c1ccc2c(c1)C(F)(F)C(F)(F)O2)C(F)(F)F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.