Using CC(C)(C)OC(=O)N[C@@H](Cc1ccc(C(F)(F)F)nc1)C(=O)C1C(=O)OC(C)(C)OC1=O to produce CC(C)(C)OC(=O)N[C@@H](Cc1ccc(C(F)(F)F)nc1)CC1C(=O)OC(C)(C)OC1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.