Using COC1COc2cc(NS(C)(=O)=O)c(Oc3ccccc3)cc2C1=O to produce COc1coc2cc(NS(C)(=O)=O)c(Oc3ccccc3)cc2c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.