Using CC[C@@H](c1ccccc1)[C@H](NC(=O)OC(C)(C)C)C(=O)N1C(=O)OC[C@@H]1c1ccccc1, OO to produce CC[C@@H](c1ccccc1)[C@H](NC(=O)OC(C)(C)C)C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.