Using CS(=O)(=O)c1ccc(I)c(C(=O)O)c1, CC1CN(C(=O)OC(C)(C)C)CCN1 to produce CC1CN(C(=O)OC(C)(C)C)CCN1C(=O)c1cc(S(C)(=O)=O)ccc1I, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.