Using N#CBr, Cc1cnc(CN(Cc2ncccc2C(C)C)C2CCNCC2)c(C)c1 to produce Cc1cnc(CN(Cc2ncccc2C(C)C)C2CCN(C#N)CC2)c(C)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.