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