Using COC(=O)c1ccc(C(=O)OC)c(S(=O)(=O)NC(C)(C)C)c1 to produce CC(C)(C)NS(=O)(=O)c1cc(C(=O)O)ccc1C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.