Using O=C(O)[C@H](Cc1ccccc1)N1C(=O)c2ccccc2C1=O, NCC(=O)c1ccccc1 to produce O=C(CNC(=O)[C@H](Cc1ccccc1)N1C(=O)c2ccccc2C1=O)c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.