Using COC(=O)C(NC(=O)c1ncc(-c2ccc([N+](=O)[O-])cc2)s1)C(C)C, O=C([O-])[O-] to produce COC(=O)C(C(C)C)N(C)C(=O)c1ncc(-c2ccc([N+](=O)[O-])cc2)s1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.