Using O=C1CCC(=O)N1Br, Cc1nc2cnc(C#N)nc2n1CC(C)(C)C to produce CC(C)(C)Cn1c(CBr)nc2cnc(C#N)nc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.