Using FC(F)(F)CI, O=S1(=O)c2ccc(O)cc2Oc2cc(F)ccc21 to produce O=S1(=O)c2ccc(F)cc2Oc2cc(OCC(F)(F)F)ccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.