Using C=C[Mg]Br, CC(C)(C)OC(=O)N=C(c1cccc(Br)c1)C(F)F to produce C=CC(NC(=O)OC(C)(C)C)(c1cccc(Br)c1)C(F)F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.