Using O=C1C=C([N+](=O)[O-])C(=O)c2ccccc21, O=C1C(Cl)=C(Cl)C(=O)c2ccccc21 to produce O=C1C(O)=C([N+](=O)[O-])C(=O)c2ccccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.