Using CC(C)(C)OC(=O)N1CC(NC(=O)OCc2ccc([N+](=O)[O-])cc2)C1 to produce O=C(NC1CNC1)OCc1ccc([N+](=O)[O-])cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.