Using Br[Mg]C1CCCCC1, O=Cc1cn2cc(C(F)(F)F)ccc2n1 to produce OC(c1cn2cc(C(F)(F)F)ccc2n1)C1CCCCC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.