Using CCOC(=O)c1ccc(NC(=O)C=Cc2ccc(Cl)cc2)cc1 to produce CCOC(=O)c1ccc(NC(=O)CCc2ccc(Cl)cc2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.