Using [N-]=[N+]=[N-], Cc1ccc2nc(N3CCS(=O)(=O)c4ccccc4C3)cc(NC(=O)CCl)c2c1 to produce Cc1ccc2nc(N3CCS(=O)(=O)c4ccccc4C3)cc(NC(=O)CN=[N+]=[N-])c2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.