Using COC(=O)c1cc(-c2nc(-c3ccc(OC)cc3)cs2)ccc1-c1ccccc1[N+](=O)[O-] to produce COc1ccc(-c2csc(-c3ccc(-c4ccccc4[N+](=O)[O-])c(C(=O)O)c3)n2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.