Using NO, COC(=O)c1ccc2c(n1)CCN(C(=O)NCc1ccccc1)C2 to produce O=C(NO)c1ccc2c(n1)CCN(C(=O)NCc1ccccc1)C2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.