Using O=S(=O)(O)O, Cc1c(-c2ccc(Cl)cc2)c2cc(OC(C)(C)CO)ccc2n1C to produce Cc1c(-c2ccc(Cl)cc2)c2cc(OC(C)(C)C(=O)O)ccc2n1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.