Using C[Mg]Br, O=c1c2cc(Br)ccc2oc2cc(OCC(F)(F)F)c(F)cc12 to produce C=C1c2cc(Br)ccc2Oc2cc(OCC(F)(F)F)c(F)cc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.