Using COc1cc(C(=O)c2ncc3ccc(NC(=O)OC(C)(C)C)cn23)ccc1[N+](=O)[O-] to produce COc1cc(C(=O)c2ncc3ccc(N)cn23)ccc1[N+](=O)[O-], please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.