Using O=S(=O)(Cc1cc(F)ccc1F)c1ccc(Cl)cc1, CCCC=O to produce CCCC(O)C(c1cc(F)ccc1F)S(=O)(=O)c1ccc(Cl)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.