Using Cc1ccc2cc(CC(=O)O)cc(C(=O)c3ccc(S(C)(=O)=O)cc3)c2c1 to produce Cc1ccc2cc(CC(=O)O)cc(Cc3ccc(S(C)(=O)=O)cc3)c2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.