Using O=C(OO)c1cccc(Cl)c1, COCCOc1nc(C)cc(SC)c1[N+](=O)[O-] to produce COCCOc1nc(C)cc(S(C)=O)c1[N+](=O)[O-], please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.