Using CCOC(=O)N1C(=O)c2ccccc2C1=O, CC(C)CC(N)C(=O)O to produce CC(C)CC(C(=O)O)N1C(=O)c2ccccc2C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.