Using O=C1c2cn(-c3c(Cl)cc(C(F)(F)F)cc3Cl)nc2CC1(F)F, C[Mg]Br to produce CC1(O)c2cn(-c3c(Cl)cc(C(F)(F)F)cc3Cl)nc2CC1(F)F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.