Using CN(Cc1ccccc1)C(=O)[C@H](Cc1cccnc1)NC(=O)[C@@H]1C[C@@H](O)CN1C(=O)OC(C)(C)C to produce CN(Cc1ccccc1)C(=O)[C@H](Cc1cccnc1)NC(=O)[C@@H]1C[C@@H](O)CN1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.