Using CNN, CCOC(=O)C(=O)CC(=O)CCN1C(=O)c2ccccc2C1=O to produce CCOC(=O)c1cc(CCN2C(=O)c3ccccc3C2=O)n(C)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.