Using COC(=O)[C@H](Cc1ccc(N)c2ccccc12)NC(=O)OC(C)(C)C to produce CC(C)(C)OC(=O)N[C@@H](Cc1ccc(N)c2ccccc12)C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.