Using CC(C)(C)OC(=O)N1CCC([C@@H](F)c2ccc(F)cc2F)CC1 to produce CC(C)(C)OC(=O)N1CCC(C(F)c2ccc(F)cc2F)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.