Using O=C(OC(=O)C(F)(F)F)C(F)(F)F, COC(=O)c1cc2c(Br)cccc2n1C to produce COC(=O)c1c(C(C)=O)c2c(Br)cccc2n1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.