Using COc1c(SC)nn(C)c(=O)c1-n1c(Cl)c(Cl)c2ccccc21, O=C(OO)c1cccc(Cl)c1 to produce COc1c(S(C)=O)nn(C)c(=O)c1-n1c(Cl)c(Cl)c2ccccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.