Using CC1(C)CCC(C)(C)C1O, O=C(NC1(C(=O)O)CC1)OCc1ccccc1 to produce CC1(C)CCC(C)(C)C1OC(=O)C1(NC(=O)OCc2ccccc2)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.