Using COC(=O)c1ccc(NC(=O)OC(C)(C)C)c([N+](=O)[O-])c1 to produce COC(=O)c1ccc(NC(=O)OC(C)(C)C)c(N)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.