Using COC(=O)c1ccc(CNC(=O)OC(C)(C)C)cc1C(=O)OC to produce CC(C)(C)OC(=O)NCc1ccc(C(=O)O)c(C(=O)O)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.