Using CC(C)(C)[O-], O=C(Cl)c1ccc([N+](=O)[O-])cc1Cl to produce CC(C)(C)OC(=O)c1ccc([N+](=O)[O-])cc1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.