Using CC(C)(C)OC(=O)CNCC(=O)OC(C)(C)C, O=C(O)c1cccc2c1CCC2=O to produce CC(C)(C)OC(=O)CN(CC(=O)OC(C)(C)C)C(=O)c1cccc2c1CCC2=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.