Using [N-]=[N+]=[N-], CC(Br)C1(CN2C(=O)c3ccccc3C2=O)OCCO1 to produce CC(N=[N+]=[N-])C(=O)CN1C(=O)c2ccccc2C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.