Using CCCCOC(=O)[C@H](O)[C@@H](Cc1ccccc1Cl)NC(=O)CCCc1ccccc1C(=O)O to produce O=C(CCCc1ccccc1C(=O)O)N[C@H](Cc1ccccc1Cl)[C@@H](O)C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.