Using CC(C)(C)OC(=O)NCCOC(CN1C(=O)c2ccccc2C1=O)CN1C(=O)c2ccccc2C1=O to produce CC(C)(C)OC(=O)NCCOC(CN)CN, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.