Using O=C1CCC(=O)N1Br, Cc1sc2ncnc(N)c2c1-c1ccc([N+](=O)[O-])cc1 to produce Nc1ncnc2sc(CBr)c(-c3ccc([N+](=O)[O-])cc3)c12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.