Using Nc1ncc(Br)nc1-c1nnc(-c2ccc(CBr)cc2)o1, CN to produce CNCc1ccc(-c2nnc(-c3nc(Br)cnc3N)o2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.