Using O=Cc1cc(C(F)(F)F)cc(C(F)(F)F)c1, C=CC[Mg]Br to produce C=CCC(O)c1cc(C(F)(F)F)cc(C(F)(F)F)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.