Using CC(C)(C)OC(=O)N1CCC(COCc2cc(Br)cc(C(F)(F)F)c2)(c2ccc(F)cc2F)CC1 to produce CN1CCC(COCc2cc(Br)cc(C(F)(F)F)c2)(c2ccc(F)cc2F)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.