Using NC(=NCCC[C@H](NC(=O)OCC1c2ccccc2-c2ccccc21)C(=O)O)N[N+](=O)[O-] to produce N=C(N)NCCC[C@H](NC(=O)OCC1c2ccccc2-c2ccccc21)C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.