Using CC(C)(C)Cn1c(CBr)cc2cnc(C#N)nc21, CCN1C(=O)NC(=O)C12CCNCC2 to produce CCN1C(=O)NC(=O)C12CCN(Cc1cc3cnc(C#N)nc3n1CC(C)(C)C)CC2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.