Using O=N[O-], COC(=O)c1ccc(-c2c(C)noc2C)c2c1NC(c1ccccc1)CO2 to produce COC(=O)c1ccc(-c2c(C)noc2C)c2c1N(N=O)C(c1ccccc1)CO2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.