Using O=C(CCl)c1ccccc1, O=C(O)c1cc(S)cc(C(F)(F)F)c1 to produce O=C(O)c1cc(SCC(=O)c2ccccc2)cc(C(F)(F)F)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.