Using CCOC(=O)COCC1OCCN(C(=O)OC(C)(C)C)CC1c1ccc(Cl)c(Cl)c1 to produce CC(C)(C)OC(=O)N1CCOC(COCC(=O)O)C(c2ccc(Cl)c(Cl)c2)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.