Using [N-]=[N+]=[N-], CCOC(=O)c1sc(SC(C)C)c2c1CCC(Br)C2=O to produce CCOC(=O)c1sc(SC(C)C)c2c1CCC(N=[N+]=[N-])C2=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.