Using CN(Cc1cc([N+](=O)[O-])cc(F)c1O)C(=O)OC(C)(C)C, O=C(CBr)C1CC1 to produce CN(Cc1cc([N+](=O)[O-])cc(F)c1OCC(=O)C1CC1)C(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.