Using CCOC(=O)c1cc(C)c2c(c1C(F)(F)F)C(=O)C(C)(C)CS2(=O)=O to produce Cc1cc(C(=O)O)c(C(F)(F)F)c2c1S(=O)(=O)CC(C)(C)C2=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.