Using O=S([O-])O, Cc1cc(C(=O)O)c(C)c2c1SCCC2OCCF to produce Cc1cc(C(=O)O)c(C)c2c1S(=O)(=O)CCC2OCCF, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.