Using COC(=O)C(O)C(C)(C)F, COc1cc(OC)nc(S(C)(=O)=O)n1 to produce COC(=O)C(Oc1nc(OC)cc(OC)n1)C(C)(C)F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.