Using COC(=O)c1cccc(S(=O)(=O)NCCC(=O)OC(C)(C)C)c1 to produce CC(C)(C)OC(=O)CCNS(=O)(=O)c1cccc(C(=O)O)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.