Using C[C@@H]1CC[C@@H](NC(=O)OC(C)(C)C)[C@H](O)CN1C(=O)OCc1ccccc1 to produce C[C@@H]1CC[C@@H](NC(=O)OC(C)(C)C)[C@H](O)CN1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.