Using CCCCCCOc1ccc(C(O)c2ccc(Cl)c(S(N)(=O)=O)c2)cc1 to produce CCCCCCOc1ccc(C(=O)c2ccc(Cl)c(S(N)(=O)=O)c2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.