Using CC(Br)C(Br)CC(=O)O, Oc1ccc(Oc2ccc(C(F)(F)F)cc2)cc1 to produce CC(C=CC(=O)O)Oc1ccc(Oc2ccc(C(F)(F)F)cc2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.