Using O=C(O)CC[C@@H](C(=O)N1NCCC[C@H]1C(=O)NCCc1ccccc1)N1C(=O)c2ccccc2C1=O to produce O=C(NCCc1ccccc1)[C@@H]1CCCN2C(=O)CC[C@H](N3C(=O)c4ccccc4C3=O)C(=O)N12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.