Using CC(C)(C)OC(=O)N1CC(=O)C1, Fc1ccc([Mg]Br)cc1 to produce CC(C)(C)OC(=O)N1CC(O)(c2ccc(F)cc2)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.