Using N[C@@H](Cc1c[nH]cn1)C(=O)O, CCOC(=O)N1C(=O)c2ccccc2C1=O to produce O=C(O)C(Cc1c[nH]cn1)N1C(=O)c2ccccc2C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.