Using O=N[O-], COCc1cc(OC)c(-c2csc3cc(OC)nn23)c(OC)c1 to produce COCc1cc(OC)c(-c2csc3c(N=O)c(OC)nn23)c(OC)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.