Using C[Mg+], CC(C)(C)OC(=O)N1c2ccc(-c3ccccc3)cc2C(CBr)=CC1(C)C to produce CCC1=CC(C)(C)N(C(=O)OC(C)(C)C)c2ccc(-c3ccccc3)cc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.