Using [O-][I+3]([O-])([O-])[O-], CCC(=O)C1=C(O)CC(c2cccc(Oc3ccc(SC)cc3)n2)CC1=O to produce CCC(=O)C1=C(O)CC(c2cccc(Oc3ccc(S(C)=O)cc3)n2)CC1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.