Using CCOC(=O)C1(Cc2cccc(C)c2)CCN(C(=O)OC(C)(C)C)CC1=O to produce CCOC(=O)C1(Cc2cccc(C)c2)CCNCC1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.