Using O=S([O-])[O-], CC(C)(C)OC(=O)N1[C@H]([C@@H](C(=O)N2C(=O)OC[C@H]2Cc2ccccc2)c2ccc(Cl)c(F)c2)CCC1(C)C to produce CC(C)(C)OC(=O)N1[C@H]([C@@H](C(=O)[O-])c2ccc(Cl)c(F)c2)CCC1(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.