Using O=C1CCC(=O)N1Br, Cc1ccc(-c2ccccc2C(F)(F)F)cc1C#N to produce N#Cc1cc(-c2ccccc2C(F)(F)F)ccc1CBr, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.