Using [Br-], CC(C)(C)OC(=O)n1ncc2cc(C(=O)Cc3ccccc3)ccc21 to produce O=C(c1ccc2[nH]ncc2c1)C(Br)c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.