Using FC(F)(Br)C(F)(Cl)CCBr, N#CC(C#N)CC(F)(F)C(F)C(F)(F)F to produce N#CC(C#N)(CCC(F)(Cl)C(F)(F)Br)CC(F)(F)C(F)C(F)(F)F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.