Using O=C(O)Cc1ccc(Nc2ccccc2[N+](=O)[O-])cc1, CO to produce COC(=O)Cc1ccc(Nc2ccccc2[N+](=O)[O-])cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.