Using COC(=O)C(O)C(C)(C)C, COC1=NC(C)=NC(OC)C1=S(=O)=O to produce COC(=O)C(Oc1nc(OC)cc(OC)n1)C(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.