Using COC(=O)c1ccc(OC)c(N(C(=O)OC(C)(C)C)S(C)(=O)=O)c1 to produce COc1ccc(C(=O)O)cc1N(C(=O)OC(C)(C)C)S(C)(=O)=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.