Using O=C(C1(c2cccc(CBr)c2)CC1)C1(c2cccc(CBr)c2)CC1, [C-]#N to produce N#CCc1cccc(C(=O)C2CC2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.