Using O=Cc1nc(-c2ccc(F)cc2)oc1Sc1ccc(Cl)cn1, C[Mg]Br to produce CC(O)c1nc(-c2ccc(F)cc2)oc1Sc1ccc(Cl)cn1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.