Using N[C@@H](Cc1c[nH]cn1)C(=O)O, O=C(O)Cc1ccccc1Nc1c(Cl)cccc1Cl to produce O=C(Cc1ccccc1Nc1c(Cl)cccc1Cl)ON[C@@H](Cc1c[nH]cn1)C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.