Using CC(C)(C)CC(O)c1ccc(CNC(=O)OC(C)(C)C)cc1F to produce CC(C)(C)CC(=O)c1ccc(CNC(=O)OC(C)(C)C)cc1F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.