Using O=C(N[C@H](Cc1ccc(-c2ccccc2)cc1)C[C@@H](CO)C(=O)O)c1nc(Cl)n[nH]1, COCCO to produce COCCOC(=O)[C@H](CO)C[C@@H](Cc1ccc(-c2ccccc2)cc1)NC(=O)c1nc(Cl)n[nH]1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.