Using CCOC(=O)C1=Cc2cccc(SC)c2OCC1, O=S(=O)([O-])O[O-] to produce CCOC(=O)C1=Cc2cccc(S(C)=O)c2OCC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.