Using OB(O)c1cncnc1, COC(=O)c1c(O)c2ccc(Br)cc2sc1=O to produce COC(=O)c1c(O)c2ccc(-c3cncnc3)cc2sc1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.