Using O=S(=O)(Cl)Cl, COC(=O)c1cc(S)cc(C(=O)OC)c1[N+](=O)[O-] to produce COC(=O)c1cc(S(=O)(=O)Cl)cc(C(=O)OC)c1[N+](=O)[O-], please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.