Using CC(C)(C)OC(=O)N1CCC(Br)(C(Br)c2cccc(Oc3ccc(C(F)(F)F)cn3)c2)CC1 to produce CC(C)(C)OC(=O)N1CCC(=C(Br)c2cccc(Oc3ccc(C(F)(F)F)cn3)c2)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.