Using COC(=O)N[C@](CCC(=O)OC(C)(C)C)(Cc1cccc(C#N)c1)C(=O)NCC(=O)OCc1ccccc1 to produce COC(=O)N[C@](CCC(=O)OC(C)(C)C)(Cc1cccc(C#N)c1)C(=O)NCC(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.