Using N#CBr, CC1(C2CCCC2)NC(=O)c2ccc(Nc3cc(N)ncn3)c(=O)n21 to produce CC1(C2CCCC2)N(C#N)C(=O)c2ccc(Nc3cc(N)ncn3)c(=O)n21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.