Using CC(C)OC(=O)C(Cc1ccc([N+](=O)[O-])cc1)C(=O)OC(C)C, CI to produce CC(C)OC(=O)C(C)(Cc1ccc([N+](=O)[O-])cc1)C(=O)OC(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.