Using CCOC(=O)c1nc(Cl)c2cccc(F)c2n1, Fc1ccc([Mg]Br)cc1 to produce O=C(c1ccc(F)cc1)c1nc(Cl)c2cccc(F)c2n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.