Using O=C=Nc1ccc([N+](=O)[O-])cc1, O=C(O)c1ccc(O)cc1 to produce O=C(Nc1ccc([N+](=O)[O-])cc1)c1ccc(O)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.