Using NC(=O)OCC1=C(C(=O)O)N2C(=O)C(NC(=O)OCc3ccc([N+](=O)[O-])cc3)[C@H]2SC1 to produce NC(=O)OCC1=C(C(=O)O)N2C(=O)C(N)[C@H]2SC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.