Using O=C(N[C@@H](Cc1ccccc1)C(O)CN[C@@H](Cc1ccccc1)C(=O)OCc1ccccc1)OCc1ccccc1 to produce N[C@@H](Cc1ccccc1)C(O)CN[C@@H](Cc1ccccc1)C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.