Using Cn1ncnc1/C(=N\O)c1ccccc1, O=C1c2ccccc2C(=O)N1c1cccc(CBr)n1 to produce Cn1ncnc1C(=NOCc1cccc(N2C(=O)c3ccccc3C2=O)n1)c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.