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